Feline caught in custom catastrophe (3-3)

I believe the answer is:

tom-cat

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

'feline caught' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'in custom catastrophe' is the wordplay.
'in' says the answer is hidden in the clue.
'TOM-CAT' is hidden in the letters of 'custom catastrophe'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app