Scientific attempt to formulate fundamental rules of squash — mutiny, PC involved! (7,7)

I believe the answer is:

quantum physics

'scientific attempt to formulate fundamental rules' is the definition.
(attempt to formulate rules of physics)

'squash mutiny pc involved' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'squash'+'mutiny'+'pc'='squashmutinypc'
'squashmutinypc' is an anagram of 'QUANTUM PHYSICS'.

'of' acts as a link.

I've seen this clue in The Guardian.

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