No end of bother in economic collapse — what's missing in it? (4)
I believe the answer is:
cash
'bother in economic collapse what's missing in it?' is the definition.
I can't tell whether this defines the answer.
'no end' is the wordplay.
'no' becomes 'c' (I can't justify this - if you can you should give a lot more credence to this answer).
'end' becomes 'ash' (I have seen 'End of fire' mean 'ash' so perhaps 'end' could also mean 'ash').
'c'+'ash'='CASH'
'of' is the link.
(Other definitions for cash that I've seen before include "Wimbledon champion" , "Brass" , "Ready money" , "bread" , "Spondulicks" .)