Be reluctant to leave extremely impressive wear (8)
I believe the answer is:
lingerie
'wear' is the definition.
(lingerie is a kind of wear)
'be reluctant to leave extremely impressive' is the wordplay.
'be reluctant to leave' becomes 'linger' (I've seen this before).
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'impressive' with its centre removed is 'ie'.
'linger'+'ie'='LINGERIE'
(Other definitions for lingerie that I've seen before include "Fancy underwear for women" , "Women's underwear and nightclothes" , "Female underwear" , "Ladies' underwear" , "Women's flimsy underwear" .)