Arab dad infiltrating computer network islands (6)
Arab Dad is ABU, Computer Network is LAN; gives LABUAN, an island in Malaysia (L + ABU + AN).
Franco-German brown egg is peaceful abode (6)
Thanks to @hexomino for this one: French for brown is BRUN, German for egg is EI. BRUN + EI = the Sultanate of BRUNEI.
Haiku song corrupted southern port (9)
Haiku song rearranged gives the southern port of KAOHSIUNG, Taiwan.
No heartless Swedes in springtime capital basin (9)
I think the Swedes as alluded to in the hint are ABBA; heartless might mean ABA. No means NIL. A springtime month is MAY. Putting it together yields NIL ABA in MAY => MA + NIL ABA + Y => MANILA BAY, a capital basin off the coast of the Philippines in the South China Sea!Thanks very much to @M Oehm, who discovered the final answer and parsing of the clue!
Darling headless ape, haven with pleasant scent (8)
@M Oehm is currently on a really nice roll here: finding that Darling = HON, the Headless Ape is KING KONG - KIN. The Haven is therefore HONG KONG, which translates to fragrant harbour.
Sodian fish view body of water (9)
Sodian = NA, the fish is TUNA, and view = SEA. Then the body of water is NATUNA SEA, an offshoot of the South China Sea. Thanks to @M Oehm for finding this!
Southern isle hiding alpha in a northern (6)
alpHA IN A Northern hides the southern Chinese isle of HAINAN.
Trachtenberg and colleague Lee make central metropolis (6)
Not Michelle but DAN Trachtenberg, and not Michelle but ANG Lee make the central metropolis of DA NANG, Vietnam. Thanks to @M Oehm for finding this!
UFO mails GF chaotically large bay (10)
UFO mails GF rearranged gives GULF OF SIAM, a large bay in Thailand
Uranium as backwater resort place (5)
uranIUM AS backwards spells SAMUI, an island in Thailand
Looks like we're in
Southeast Asia this time! Per @WAF, we might be more specifically in the (hotly contested) South China Sea! Thanks, @WAF!