Flog half a case for fifty quid (4)

I believe the answer is:

sell

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'flog' is the definition.
(I've seen this before)

'half a case for fifty quid' is the wordplay.
'half a' indicates taking half.
'for' is a charade indicator (letters next to each other).
'fifty quid' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'case' halved is 'se'.
'se'+'ll'='SELL'

Can you help me to learn more?

(Other definitions for sell that I've seen before include "Market, vend" , "Give up for a price" , "Traffic" , "disappointment?" , "Exchange for cash" .)

I've seen this clue in the Evening Standard.

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