Crossword Genius

Test former partner before noon (4)

Ross

I believe the answer is:

exam

'test' is the definition.
(synonyms)

'former partner before noon' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'before noon' becomes 'am'.
'ex'+'am'='EXAM'

(Other definitions for exam that I've seen before include "One taken by candidate" , "School test (colloq.)" , "Formal knowledge test" , "'Test, in short (4)'" , "paper" .)

I've seen this clue in The Sun.
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