One might forbear to sing it (7)

I believe the answer is:

refrain

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'one might forbear' is the definition.
'refrain' can be an answer for 'forbear' (I've seen this before). I'm not sure about the 'one might' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for refrain that I've seen before include "Cease - repeated phrase" , "Abstain; chorus" , "Hold back" , "Musical phrase" , "Stop - chorus" .)

I've seen this clue in the Evening Standard.

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