Nonconformists waste nothing they say (10)

I believe the answer is:

refuseniks

'nonconformists' is the definition.
(people who refuse to follow orders)

'waste nothing they say' is the wordplay.
'waste' becomes 'refuse' (refuse is a kind of waste).
'nothing' becomes 'nix' (nix can mean nothing).
'they say' indicates a 'sounds like' (homophone) clue.
'nix' sounds like 'niks'.
'refuse'+'niks'='REFUSENIKS'

I've seen this clue in The Times.

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