Score less than a hundred (6)

I believe the answer is:

eighty

'score less than a hundred' is the definition.
(a score can mean twenty)

This is all the clue.

(Other definitions for eighty that I've seen before include "score less than a hundred" , "4 score" , "Cardinal" , "'Nineteen -- Four' (novel)" , "LXXX" .)

I've seen this clue in The Globe and Mail.

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