Crossword Genius

One who’s back in Poirot cast? (5)

Ross

I believe the answer is:

actor

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'one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'back in poirot cast?' is the wordplay.
'back' says the letters should be written backwards.
'in' indicates a hidden word.
'rotca' can be found hidden inside 'poirot cast'.
'rotca' backwards is 'ACTOR'.

'who's' acts as a link.

Can you help me to learn more?

(Other definitions for actor that I've seen before include "Theatrical player" , "I pretend" , "Croat (anag.)" , "Player - performer" , "Performer in drama" .)

I've seen this clue in The Times.
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