It's good that we get fifty quid (4)
I believe the answer is:
well
'it's good' is the definition.
(similar in meaning)
'we get fifty quid' is the wordplay.
'get' 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).
'we'+'ll'='WELL'
'that' is the link.
Can you help me to learn more?
(Other definitions for well that I've seen before include "Abundant source" , "31 [SPRING]" , "Lift-shaft" , "The - at the World's End (William Morris)" , "Flood - thoroughly" .)