In green, a melamine coating (6)

I believe the answer is:

enamel

'coating' is the definition.
(enamel is a kind of coating)

'in green a melamine' is the wordplay.
'in' says the answer is hidden in the clue.
'ENAMEL' can be found hidden inside 'green a melamine'.

(Other definitions for enamel that I've seen before include "Chopper coating?" , "Hard material" , "hard stuff" , "Outer tooth material" , "Tooth surface" .)

I've seen this clue in The Guardian.

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