Crossword Genius

Being consistent, gave ally half, showing impartiality (12)

Ross

I believe the answer is:

evenhandedly

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'being consistent gave ally half showing impartiality' is the definition.
I can't judge whether this definition defines the answer.

'being consistent gave ally half' is the wordplay.
'being consistent' becomes 'even' (I've seen this before).
'gave' becomes 'handed' ('hand' can be a synonym of 'give').
'half' suggests halving the letters.
'ally' cut in half is 'ly'.
'even'+'handed'+'ly'='EVENHANDEDLY'

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I've seen this clue in The Irish Times.
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