It's better to be sincere at heart, albeit shifty! (5)

I believe the answer is:

nicer

I'm a little stuck... Click here to teach me more about this clue!

'it's better' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for nicer that I've seen before include "improved" , "Pleasanter" , "More pleasant or agreeable" , "more lovely" , "relatively pleasant" .)

I've seen this clue in the Evening Standard.

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