Caught bum with 50 euro buckle (7)

I believe the answer is:

crumple

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

'buckle' is the definition.
(I know that buckle can be written as crumple)

'caught bum with 50 euro' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'bum with' becomes 'rump' (synonyms. I am not sure about the 'with' bit.).
'50' becomes 'l' (Roman numeral).
'euro' becomes 'E' (E resembles the Euro symbol).
'c'+'rump'+'l'+'e'='CRUMPLE'

Can you help me to learn more?

(Other definitions for crumple that I've seen before include "Crease" , "Go to pieces" , "Become crushed" , "wrinkle" , "Become creased and wrinkled" .)

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

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