Plug clothes in speech (7)
I believe the answer is:
address
'speech' is the definition.
(address is a kind of speech)
'plug clothes' is the wordplay.
'plug' becomes 'ad' (Advertisement plugs products).
'clothes' becomes 'dress' (dress is a kind of clothes**).
'ad'+'dress'='ADDRESS'
'in' acts as a link.
(Other definitions for address that I've seen before include "Form of identification for building" , "Speak to, approach" , "Where you live" , "Sermon - lodging" , "In almost desperate straits" .)