Wow! Female in New Jersey, say, making bloomer (10)
I believe the answer is:
cornflower
'bloomer' is the definition.
(I know that cornflower is a type of bloomer)
'wow female in new jersey say' is the wordplay.
'wow' becomes 'cor' (both are expressions of surprise).
'female' becomes 'f' (common abbreviation).
'in' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'jersey say' becomes 'lower' (jersey is a type of cow - animal that moos or lows).
'n'+'lower'='nlower'
'f' placed within 'nlower' is 'nflower'.
'cor'+'nflower'='CORNFLOWER'
'making' acts as a link.
(Other definitions for cornflower that I've seen before include "Beautiful weed" , "plant" , "Bluebottle" , "sauce thickener, say" , "Bloom" .)