Star actors possibly (6)

I believe the answer is:

castor

'star' is the definition.
(Castor is an example)

'actors possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'actors' with letters rearranged gives 'CASTOR'.

(Other definitions for castor that I've seen before include "for wheel? Yes and no" , "Small swivelling wheel on a furniture leg" , "Sprinkler" , "Fur of the beaver" , "Pollux's twin" .)

I've seen this clue in the Evening Standard.

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