Crossword Genius

Away match following pitch upset (5,3,7)

Ross

I believe the answer is:

throw off balance

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'upset' is the definition.
(thesaurus)

'away match following pitch' is the wordplay.
I cannot really see how this works, but
'away' could be 'off' (synonyms) and 'off' is located in the answer.
'match' could be 'balance' (balancing is a kind of matching) and 'balance' is found in the answer.
'pitch' could be 'throw' (I've seen this in another clue) and 'throw' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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