Opponent featured in Greene, mysterious (5)

I believe the answer is:

enemy

'opponent' is the definition.
(I know that enemy is a type of opponent)

'featured in greene mysterious' is the wordplay.
'featured in' indicates the answer is hidden within the clue.
'ENEMY' is hidden in the letters of 'greene mysterious'.

(Other definitions for enemy that I've seen before include "Division" , "Hostile person, foe" , "one in opposition" , "Yemen (anag.)" , "Antagonist" .)

I've seen this clue in The Sun.

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