Blouse or cardigan (3)
I believe the answer is:
top
'blouse or cardigan' is the definition.
(I know that blouse is a type of top)
This is the entire clue.
(Other definitions for top that I've seen before include "Uppermost part" , "The circus tent can be a big one" , "Toy; uppermost point" , "jumper, say?" , "Crown" .)