Curse about extremely threadbare pullover (7)
I believe the answer is:
sweater
'pullover' is the definition.
(I've seen this before)
'curse about extremely threadbare' is the wordplay.
'curse' becomes 'swear' ('swear' can be a synonym of 'curse'**).
'about' indicates putting letters inside.
'extremely' says to hollow out the word (remove centre letters).
'threadbare' becomes 'trite' ('trite' can be a synonym of 'threadbare').
'trite' with its centre removed is 'te'.
'swear' going around 'te' is 'SWEATER'.
(Other definitions for sweater that I've seen before include "Re waste: it's a garment" , "Jumper or jersey" , "Heavy jersey" , "Guernsey" , "Long-sleeved pullover" .)