I get fifty quid for being sick (3)

I believe the answer is:

ill

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'sick' is the definition.
(I know that sick can be written as ill)

'i get fifty quid for' is the wordplay.
'get' is a charade indicator (letters next to each other).
'fifty quid for' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'i'+'ll'='ILL'

'being' acts as a link.

Can you help me to learn more?

(Other definitions for ill that I've seen before include "state of America" , "Valetudinarian" , "poor" , "Where to find Chicago" , "Misfortune" .)

I've seen this clue in the Evening Standard.

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