Extremely agitated groom gives speech (7)
I believe the answer is:
Here is my best explanation:
'speech' is the definition.
('address' can be a synonym of 'speech')
'extremely agitated groom' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'groom' becomes 'dress' ('dress' can be a synonym of 'groom').
'agitated' with its centre removed is 'ad'.
'gives' acts as a link.
(Other definitions for address that I've seen before include "Discourse", "Place where someone lives", "Talk - indication of house", "skilfulness or tact", "Think about", "Form of identification for building", "Speak formally to an audience", "Speak to, approach", "details on envelope" and "place".)