Conspicuous among introverts (5)
I believe the answer is:
overt
'conspicuous' is the definition.
(I've seen this in another clue)
'among introverts' is the wordplay.
'among' indicates a hidden word.
'OVERT' is hidden in the letters of 'introverts'.
(Other definitions for overt that I've seen before include "Open and candid" , "Open and unconcealed" , "totally visible" , "Obvious, patent" , "Done in an obvious way" .)