Less affable Independent setter for a change (7)

I believe the answer is:

testier

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'less affable' is the definition.
I can't judge whether this definition defines the answer.

'independent setter for a change' is the wordplay.
'independent' becomes 'i'.
'for a change' indicates anagramming the letters.
'i'+'setter'='isetter'
'isetter' anagrammed gives 'TESTIER'.

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(Other definitions for testier that I've seen before include "more crusty" , "more irritable" , "More likely to become annoyed" .)

I've seen this clue in The Independent.

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