Simple coat's reversible hood (7)
I believe the answer is:
ruffian
'hood' is the definition.
(thesaurus)
'simple coat's reversible' is the wordplay.
'simple' becomes 'naif' ('naif' can be similar in meaning to 'simple'**).
'coat' becomes 'fur' (fur is a kind of coat).
'reversible' says the letters should be written backwards.
'naif'+'fur'='naiffur'
'naiffur' written backwards gives 'RUFFIAN'.
(Other definitions for ruffian that I've seen before include "Scoundrel" , "Violent criminal" , "Bully" , "Aggressive, rude troublemaker" , "Roughneck" .)