Crossword Genius

Numbers sent off (4)

Ross

I believe the answer is:

tens

'numbers' is the definition.
(ten is a kind of number)

'sent off' is the wordplay.
'off' indicates anagramming the letters.
'sent' anagrammed gives 'TENS'.

(Other definitions for tens that I've seen before include "Half-scores" , "X, X, X, ..." , "At least 20" , "Cardinal numbers" .)

I've seen this clue in The Times.
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