Hellenic hero otherwise reveals cigar (7)
I believe the answer is:
cheroot
'cigar' is the definition.
(cheroot is a kind of cigar)
'hellenic hero otherwise reveals' is the wordplay.
'reveals' says the answer is hidden in the clue.
'CHEROOT' can be found hidden inside 'hellenic hero otherwise'.
(Other definitions for cheroot that I've seen before include "Type of cigar" , "Cigar with open ends - hot core (anag)" , "With both ends cut off squarely, is smoked" , "Variety of cigar" , "Cigar cut at both ends" .)