Groom with lovely female going to marry (7)
I believe the answer is:
combine
'marry' is the definition.
(I've seen this before)
'groom with lovely female going' is the wordplay.
'groom' becomes 'comb' (combing is a way of grooming oneself).
'with' means one lot of letters go next to another.
'lovely' becomes 'fine' (fine can mean lovely or beautiful).
'female' becomes 'f' (common abbreviation).
'going' suggests deleting specific letters.
'fine' with 'f' removed is 'ine'.
'comb'+'ine'='COMBINE'
'to' is the link.
(Other definitions for combine that I've seen before include "Mix together different elements" , "Put together" , "Blend" , "Unite, merge" , "marry" .)