Crossword Genius

Upset the fruit barrel (3)

Ross

I believe the answer is:

tun

I'm a little stuck... Click here to teach me more about this clue!

'barrel' is the definition.
(I know that tun is a type of barrel)

'upset the fruit' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
The remaining letters 'un' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for tun that I've seen before include "Large cask for liquid" , "'Large cask, for beer perhaps (3)'" , "Quite enough wine" , "beer barrel" , "One can hold wine" .)

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