Mercury, for instance (6)

I believe the answer is:

planet

'mercury for instance' is the definition.
(Mercury is an example)

This is all the clue.

(Other definitions for planet that I've seen before include "Eg, Mars or Pluto" , "Large body orbiting sun" , "Substantial heavenly body" , "Eg, Mars, Venus" , "massive revolver" .)

I've seen this clue in the Evening Standard.

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