Liberal with no previous partner for instance (5)
I believe the answer is:
ample
'liberal' is the definition.
(I've seen this before)
'no previous partner for instance' is the wordplay.
'no' is a deletion indicator.
'previous partner' becomes 'ex' (I've seen this in other clues).
'for instance' becomes 'example' (I've seen this before).
'example' with 'ex' taken away is 'AMPLE'.
'with' acts as a link.
(Other definitions for ample that I've seen before include "Quite sufficient, more than enough" , "Big" , "Full-figured" , "Plentiful, quite enough" , "Spacious" .)