Unwise to take a girl in for something to eat (6)
I believe the answer is:
radish
'something to eat' is the definition.
(radish is a kind of food)
'unwise to take a girl in' is the wordplay.
'unwise' becomes 'rash'.
'to take' suggests deleting specific letters.
'girl' becomes 'adi' ().
'in' means one lot of letters goes inside another.
'rash' with 'a' taken out is 'rsh'.
'rsh' placed around 'adi' is 'RADISH'.
'for' acts as a link.
(Other definitions for radish that I've seen before include "Pungent, red salad vegetable" , "Small red salad vegetable" , "Bit of salad" , "Pungent fleshy edible root eaten in salads" , "Pungent red salad root" .)