Gangster club goes to waste - lacking a leader, it's a source of frustration that one has to carry (9)
I believe the answer is:
albatross
'waste lacking a leader it's a source of frustration that one has to carry' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'gangster club goes' is the wordplay.
'gangster' becomes 'al' (Al Capone).
'club' becomes 'bat' (as in sporting equipment).
'goes' becomes 'ross' (I can't justify this - if you can you should believe this answer much more).
'al'+'bat'+'ross'='ALBATROSS'
'to' is the link.
Can you help me to learn more?
(Other definitions for albatross that I've seen before include "The bird of The Ancient Mari- ner" , "Excellent golf score" , "See 7" , "Large seabird or constant burden" , "High-flyer" .)