Ought to be a good rhyme (6)

I believe the answer is:

should

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'ought to' is the definition.
('you ought to' means 'you should')

I can't explain the remainder of the clue.

(Other definitions for should that I've seen before include "Has an obligation to (do)" , "Ought" , "Had better" , "Past tense of 'shall'" , "Has a duty to (do)" .)

I've seen this clue in the Evening Standard.

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