Speech giving notice to groom? (7)
I believe the answer is:
Here is my best explanation:
'speech' is the definition.
(address is a kind of speech)
'giving notice to groom?' is the subsidiary indication.
'giving' is a charade indicator (letters next to each other).
'notice' becomes 'ad'.
'to groom?' becomes 'dress' (dressing is a kind of grooming**).
'ad' put next to 'dress' is 'address'.
(Other definitions for address that I've seen before include "Deal with", "Speak to at home?", "Place where someone lives", "Speak to - direct", "Sermon - lodging", "Speech; one's home", "place", "Give a speech to", "lecture?" and "Attend".)