Crossword Genius

Kevin could act the stern CO, possibly (7)

Ross

I believe the answer is:

costner

I'm a little stuck... Click here to teach me more about this clue!

'kevin could act' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'stern co possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'stern'+'co'='sternco'
'sternco' anagrammed gives 'COSTNER'.

'the' is the link.

Can you help me to learn more?

(Another definition for costner that I've seen is " US actor".)

I've seen this clue in the Evening Standard.
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