Notice groom making speech (7)
I believe the answer is:
address
'speech' is the definition.
('address' can be a synonym of 'speech')
'notice groom' is the wordplay.
'notice' becomes 'ad'.
'groom' becomes 'dress' ('dress' can be a synonym of 'groom').
'ad'+'dress'='ADDRESS'
'making' is the link.
(Other definitions for address that I've seen before include "Form of identification for building" , "Speech - written on an envelope?" , "lecture?" , "Where one lives" , "skilfulness or tact" .)