Reveal I am Sting making a comeback (6)
I believe the answer is:
impart
'reveal' is the definition.
(synonyms)
'i am sting making a comeback' is the wordplay.
'i am' becomes 'I'm'.
'sting' becomes 'trap' (sting can mean a trap).
'making a comeback' shows that the letters should be reversed in order.
'trap' in reverse letter order is 'part'.
'im'+'part'='IMPART'
(Other definitions for impart that I've seen before include "Divulge, make known" , "Give, say information, make known" , "Pass on information" , "Pass on (knowledge, info)" , "Hand on" .)