My prefix is playful
My infix is a position
My postfix is rocky
I am fake in definition


You are

an impostor

"My prefix is playful"

an imp is playful

"My infix is a position"

one's position, particularly in the military, might be called one's post

"My postfix is rocky"

a rocky tor

"I am fake in definition"

An impostor is fake, naturally!

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