Crossword Genius

Woman has university student to invalidate (5)

Ross

I believe the answer is:

annul

'invalidate' is the definition.
('annul' can be a synonym of 'invalidate')

'woman has university student' is the wordplay.
'woman' becomes 'ann' (**).
'has' says to put letters next to each other.
'university' becomes 'u'.
'student' becomes 'l' (as in L-plates for learner drivers).
'ann'+'u'+'l'='ANNUL'

'to' is the link.

(Other definitions for annul that I've seen before include "Declare void" , "Make invalid" , "Countermand" , "Cancel, abolish" , "Recall" .)

I've seen this clue in The Mirror.
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