Fall in messy lumps (5)

I believe the answer is:

slump

'fall in' is the definition.
(slumping is a kind of falling in)

'messy lumps' is the wordplay.
'messy' is an anagram indicator.
'lumps' anagrammed gives 'SLUMP'.

(Other definitions for slump that I've seen before include "Bad economic recession" , "Marked decline" , "Commercial decline" , "Sudden fall as in share values" , "flop" .)

I've seen this clue in the Evening Standard.

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