Dressed Green Man in overall (7)
I believe the answer is:
general
'overall' is the definition.
(similar in meaning)
'dressed green man' is the wordplay.
'dressed' indicates anagramming the letters ('dress' can mean 'prepare').
'man' becomes 'al' ().
'green' anagrammed gives 'gener'.
'gener'+'al'='GENERAL'
'in' acts as a link.
(Other definitions for general that I've seen before include "Non-specialist - army officer" , "Rank; normal, usual" , "top brass" , "Catholic" , "Not particular or specific" .)