Crossword Genius

Actor opts, occasionally, to play river dweller? (4)

Ross

I believe the answer is:

coot

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'play river dweller?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'actor opts occasionally' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'actor'+'opts'='actoropts'
The alternate letters of 'actoropts' are 'COOT'.

'to' is the link.

Can you help me to learn more?

(Other definitions for coot that I've seen before include "Slow-flying birds, duck-like" , "Blackish aquatic bird" , "Slow-flying bird, resembling a duck" , "Waterfowl" , "Stupid or eccentric man" .)

I've seen this clue in The Irish Times.
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