Clever remarks about headgear or something (7)
I believe the answer is:
whatsit
'something' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'clever remarks about headgear' is the wordplay.
'clever remarks' becomes 'wit' (I can't justify this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'headgear' becomes 'hats' (I've seen this before).
'wit' going around 'hats' is 'WHATSIT'.
'or' is the link.
Can you help me to learn more?
(Other definitions for whatsit that I've seen before include "Thingummy" , "Thingumajig" , "Something one can't recall" , "person not to be named" , "something indefinable" .)