Don't be a burden (7)

I believe the answer is:

refrain

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'a burden' is the definition.
(I've seen this before)

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

(Other definitions for refrain that I've seen before include "Stop - chorus" , "Lines repeated at the end of each verse" , "Don't do that - it's a song" , "Hold back" , "Chorus; keep away (from)" .)

I've seen this clue in The Guardian.

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