Responds to encore call? (5)

I believe the answer is:

react

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'responds to' is the definition.
I can't judge whether this definition defines the answer.

'encore call?' is the wordplay.
'encore' becomes 're' (I am not sure about this - if you are sure you should believe this answer much more).
'call?' becomes 'act' (call is a kind of act).
're'+'act'='REACT'

Can you help me to learn more?

(Other definitions for react that I've seen before include "Respond emotionally" , "provide an answer" , "What a chemical might do" , "Retaliate" , "Take" .)

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

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