Dissimilar woman with dig (7)
I believe the answer is:
unalike
'dissimilar' is the definition.
('unalike' can be a synonym of 'dissimilar')
'woman with dig' is the wordplay.
'woman' becomes 'una' (**).
'with' is a charade indicator (letters next to each other).
'dig' becomes 'like' (I've seen this in other clues).
'una'+'like'='UNALIKE'
(Other definitions for unalike that I've seen before include "poor match" , "Differing from each other" , "Dissimilar" , "Incompatible" , "Not similar to one another" .)