Bit of bread and fish falling to pieces (9)

I believe the answer is:

crumbling

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'falling to pieces' is the definition.
'crumbling' can be an answer for 'falling' (thesaurus). I am not certain of the 'to pieces' bit.

'bit of bread and fish' is the wordplay.
'bit of bread' becomes 'crumb' (I've seen this before).
'and' says to put letters next to each other.
'fish' becomes 'ling' (ling is a kind of fish).
'crumb'+'ling'='CRUMBLING'

Can you help me to learn more?

(Another definition for crumbling that I've seen is " Breaking".)

I've seen this clue in The Telegraph.

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