My first connect-wall was too easy; here is a hard one, as promised.
There are four categories of five words each:
wetsuit crystal blue lie
sink wire bear aura
barcode marker swiss LED
gate syrian airbag hail
saga relay duck IC
Enjoy!
Hints:
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Time to get innovative! (Maybe the clock will be your Bain?)
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You can replace "syrian" with "tulum"
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Wired in by now?