Starts to shred packaging after receiving box (4)

I believe the answer is:

spar

'box' is the definition.
(spar can mean to box)

'starts to shred packaging after receiving' is the wordplay.
'starts to' says to take the initial letters.
The initial letters of 'shred packaging after receiving' is 'SPAR'.

(Other definitions for spar that I've seen before include "Engage in argument" , "Length of wood" , "Scrap" , "have an argument without marked hostility" , "Mineral; strong pole" .)

I've seen this clue in The Times.

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