Crossword Genius

The setter's test is better (7)

Ross

I believe the answer is:

improve

'better' is the definition.
('improve' can be a synonym of 'better')

'the setter's test' is the wordplay.
'the setter's' becomes 'im' (I've seen this in other clues).
'test' becomes 'prove' ('prove' can be a synonym of 'test').
'im'+'prove'='IMPROVE'

'is' is the link.

(Other definitions for improve that I've seen before include "Become better" , "Enhance" , "Change for the better" , "Make better in quality" , "Ameliorate" .)

I've seen this clue in The Telegraph.
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