Dress a very quiet earl ridiculously (7)
I believe the answer is:
apparel
'dress' is the definition.
(synonyms)
'a very quiet earl ridiculously' is the wordplay.
'very quiet' becomes 'pp' (musical abbreviation for pianissimo).
'ridiculously' indicates an anagram.
'earl' with letters rearranged gives 'arel'.
'a'+'pp'+'arel'='APPAREL'
(Other definitions for apparel that I've seen before include "kit" , "Fancy gear" , "Real pap (anag) - clothing" , "Clothes - garments" , "what's in the press?" .)