Crossword Genius

Dealing with everything when angry, one can blow it (3-4)

Ross

I believe the answer is:

one-stop

'dealing with everything' is the definition.
(as in a one-stop shop)

'when angry one can blow it' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

(Another definition for one-stop that I've seen is " (Of a store) providing a variety of goods and services".)

I've seen this clue in The Times.
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