Also helps give you a smooth back (3)

I believe the answer is:

too

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'also' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for too that I've seen before include "On top - also" , "Also; overly" , "To a greater than desirable extent" , "Additionally" , "Furthermore" .)

I've seen this clue in the Evening Standard.

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