Lack of tin at party shows negative attitude (2,3,2)
I believe the answer is:
no can do
'lack' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'tin at party shows negative attitude' is the wordplay.
I cannot really see how this works, but
'tin' could be 'can' (synonyms) and 'can' is present in the answer.
'party' could be 'do' (do is a kind of party) and 'do' is present in the answer.
'negative' could be 'no' (no is a kind of negative) and 'no' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for no can do that I've seen before include "Can't manage it, see doc anon" , "Bring-a-bottle party?" , "Nothing manageable" , "That's out of the question!" , "Impossible, I'm afraid!" .)