Looking a bit sick, paid out fifty quid (6)
I believe the answer is:
pallid
'looking a bit sick' is the definition.
The answer and definition are not the same part of speech.
'paid out fifty quid' is the wordplay.
'out' means one lot of letters goes inside another.
'fifty quid' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'paid' going around 'll' is 'PALLID'.
Can you help me to learn more?
(Other definitions for pallid that I've seen before include "Pale, insipid" , "Pale complexion because of poor health" , "Without healthy colour" , "lacking colour or brightness" , "Sickly pale" .)