Crushed nuts the female's tucked into (6)
I believe the answer is:
mashed
'crushed' is the definition.
('mash' can be a synonym of 'crush')
'nuts the female's tucked into' is the wordplay.
'nuts' becomes 'mad' (I've seen this in other clues).
'the female' becomes 'she' (I've seen this before).
'tucked into' means one lot of letters goes inside another (I've seen this in other clues).
'mad' going around 'she' is 'MASHED'.
(Other definitions for mashed that I've seen before include "Pulped like potatoes" , "Pounded to small pieces" , "Reduced to pulp" , "Pulped or crushed as potatoes may be" , "Very drunk" .)