Crossword Genius

Carry on square boxes (7)

Ross

I believe the answer is:

cartons

'boxes' is the definition.
(carton is a kind of box)

'carry on square' is the wordplay.
'carry' becomes 'cart' (carting is a kind of carrying).
'square' becomes 's' (abbreviation).
'cart'+'on'+'s'='CARTONS'

(Another definition for cartons that I've seen is " Cardboard containers".)

I've seen this clue in the Sydney Morning Herald.
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