Groom and lovely female going to marry (7)
I believe the answer is:
combine
'marry' is the definition.
(I've seen this before)
'groom and lovely female going' is the wordplay.
'groom' becomes 'comb' (combing is a kind of grooming).
'and' means one lot of letters go next to another.
'lovely' becomes 'fine' (fine can mean lovely or beautiful).
'female' becomes 'f' (common abbreviation).
'going' indicates named letters should be taken away.
'fine' with 'f' taken out is 'ine'.
'comb'+'ine'='COMBINE'
'to' acts as a link.
(Other definitions for combine that I've seen before include "Unite; -- harvester" , "Association" , "Put together" , "Mix together different elements" , "Blend" .)