Whatsit (9)

I believe the answer is:
thingummy
'whatsit' is the definition.
(both can mean an unspecified object)
This is the entire clue.
(Other definitions for thingummy that I've seen before include "Unidentified object" , "whose name one's forgotten" , "unknown object" , "Whatsit" , "what's-its-name" .)