Have a position with female willingly (4)
I believe the answer is:
lief
'willingly' is the definition.
(I've seen this before)
'have a position with female' is the wordplay.
I cannot really understand how this works, but
'position' could be 'lie' (lie can mean to place or position) and 'lie' is found within the answer.
'female' could be 'f' (abbreviation) and 'f' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for lief that I've seen is " In old usage, gladly or willingly - file away".)