Wealth starts dissipating - it could break you (3,4,5)

I believe the answer is:

the last straw

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'it could break you' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'wealth starts dissipating' is the wordplay.
'dissipating' is an anagram indicator.
'wealth'+'starts'='wealthstarts'
'wealthstarts' with letters rearranged gives 'THE LAST STRAW'.

Can you help me to learn more?

(Other definitions for the last straw that I've seen before include "which is fatal for the camel" , "Ultimate event making a situation unbearable" , "Ultimate setback (for the camel?)" .)

I've seen this clue in The Irish Times.

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