Skinflints that drunk lumps (9)

I believe the answer is:

tightwads

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'skinflints' is the definition.
('tightwad' can be a synonym of 'skinflint')

'drunk lumps' is the wordplay.
'drunk' becomes 'tight' (slang term).
'lumps' becomes 'wads' (I can't explain this - if you can you should believe this answer much more).
'tight'+'wads'='TIGHTWADS'

'that' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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