Might his clean thinking stir up change? (6)

I believe the answer is:

purist

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'might his clean thinking' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'stir up change?' is the wordplay.
'change?' indicates anagramming the letters (I've seen 'change' mean this).
'stir'+'up'='stirup'
'stirup' with letters rearranged gives 'PURIST'.

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(Other definitions for purist that I've seen before include "Stir up (anag) - pedant" , "Fastidious person" , "One who insists on precision and correctness" , "Pedantic type" , "Over-fastidious person" .)

I've seen this clue in the Evening Standard.

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