Crossword Genius

One gets fifty quid for the lot (3)

Ross

I believe the answer is:

all

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'the lot' is the definition.
(I've seen this in another clue)

'one gets fifty quid' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'gets' says to put letters next to each other.
'fifty quid' becomes 'll' (I can't justify this - if you can you should believe this answer much more).
'a'+'ll'='ALL'

'for' is the link.

Can you help me to learn more?

(Other definitions for all that I've seen before include "The works" , "Garden passage between trees or bushes" , "without exception" , "Wholly" , "Total" .)

I've seen this clue in the Evening Standard.
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