Smart little Maureen, good-looker? (6)
I believe the answer is:
modish
'smart' is the definition.
(thesaurus)
'little maureen good-looker?' is the wordplay.
'little maureen' becomes 'Mo' (Mo can be short for Maureen).
'good looker?' becomes 'dish' (I've seen this in other clues).
'mo'+'dish'='MODISH'
(Other definitions for modish that I've seen before include "I'm shod in the current fashion" , "in the latest fashion?" , "In fashion or style" , "Trendy" , "In vogue or fashion" .)