Setter's mature public front (5)
I believe the answer is:
image
'public front' is the definition.
'image' can be an answer for 'front' (thesaurus). I'm not certain of the 'public' bit.
'setter's mature' is the wordplay.
'setter's' becomes 'I'm' (referring to the crossword setter).
'mature' becomes 'age' (synonyms).
'im'+'age'='IMAGE'
Can you help me to learn more?
(Other definitions for image that I've seen before include "Visual or mental representation" , "Likeness, could be spitting" , "External impression" , "Picture (involving one letter change from 10)" , "Likeness U symbol" .)