Don't be abrupt - play it smooth! (6)

I believe the answer is:

legato

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'smooth' is the definition.
(musical term)

I don't understand the rest of the clue.

(Other definitions for legato that I've seen before include "Don't play roughly" , "Smooth, flowing (mus.)" , "Smoothly flowing in style" , "In music, the opposite of staccato" , "(Music) without breaks between notes" .)

I've seen this clue in the Evening Standard.

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