Whale upset by one caught in crazy gymnastic performances (10)

I believe the answer is:

acrobatics

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'gymnastic performances' is the definition.
(performances by an acrobat)

'whale upset by one caught in' is the wordplay.
'whale upset by' becomes 'acrobats' (I can't justify this - if you can you should believe this answer much more).
'one' becomes 'I' (Roman numeral).
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'i'+'c'='ic'
'acrobats' enclosing 'ic' is 'ACROBATICS'.

'crazy' acts as a link.
This may not be correct. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for acrobatics that I've seen before include "pursuit of tumblers" , "What one may see in circus" .)

I've seen this clue in The Guardian.

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