Crossword Genius

Let's sack drunk that's negligent beyond compare (8)

Ross

I believe the answer is:

slackest

'negligent beyond compare' is the definition.
(the most negligent or slack)

'let's sack drunk' is the wordplay.
'drunk' is an anagram indicator.
'lets'+'sack'='letssack'
'letssack' is an anagram of 'SLACKEST'.

'that's' is the link.

I've seen this clue in The Independent.
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