Chatting about headwear (3)
I believe the answer is:
hat
'headwear' is the definition.
(hat is a type of headwear)
'chatting about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'HAT' is hidden in the letters of 'chatting'.
(Other definitions for hat that I've seen before include "Cap" , "opera?" , "Headwear" , "Head-covering" , "Eg, derby" .)