Unconventional, like inept drummer? (7)

I believe the answer is:

offbeat

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'unconventional' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

(Other definitions for offbeat that I've seen before include "Way-out" , "Unconventional or lacking rhythm" , "Wacky; syncopated" , "Quirky" , "Strange" .)

I've seen this clue in The Daily Express.

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