Singer to hand in notice (6)

I believe the answer is:

resign

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'hand in notice' is the definition.
(to hand in one's notice is to resign)

'singer' is the wordplay.
'singer' anagrams to 'RESIGN'.
But, I am not sure how this is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for resign that I've seen before include "Turn over" , "Abdicate" , "Quit" , "withdraw" , "admit defeat" .)

I've seen this clue in The Irish Independent.

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