Excellent act deserving an encore (4,4)

I believe the answer is:

good turn

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'deserving an encore' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'excellent act' is the wordplay.
'excellent' becomes 'good'.
'act' becomes 'turn' (a routine or performance).
'good'+'turn'='GOOD TURN'

Can you help me to learn more?

(Other definitions for good turn that I've seen before include "''One . . . . . . . . deserves another'' (4, 4)" , "star performer" , "Something done to help" , "Helping hand" , "Nice act" .)

I've seen this clue in The Globe and Mail.

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