Crossword Genius

Their hollow measure could be best? (7)

Ross

I believe the answer is:

trounce

'be best?' is the definition.
(I've seen this before)

'their hollow measure' is the wordplay.
'hollow' means to remove the middle letters.
'measure' becomes 'ounce' (ounce is a kind of measure).
'their' with its centre taken out is 'tr'.
'tr'+'ounce'='TROUNCE'

'could' is the link.

(Other definitions for trounce that I've seen before include "Clobber" , "Crush" , "Roundly defeat" , "Beat heavily" , "summons" .)

I've seen this clue in The Telegraph.
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