Sensitive god, looking back (4)
I believe the answer is:
sore
'sensitive' is the definition.
(synonyms)
'god looking back' is the wordplay.
'god' becomes 'Eros' (Eros is an example).
'looking back' says the letters should be written backwards.
'eros' written backwards gives 'SORE'.
(Other definitions for sore that I've seen before include "source of distress" , "Feeling pain or informally angry" , "Causing or suffering pain" , "Hard" , "Irritated or painful" .)