Crossword Genius

Drags regulars from sack, then helps invalid (7)

Ross

I believe the answer is:

schleps

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'drags regulars' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'sack then helps invalid' is the wordplay.
'sack then' becomes 'sc' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'invalid' indicates anagramming the letters.
'helps' is an anagram of 'hleps'.
'sc'+'hleps'='SCHLEPS'

'from' acts as a link.

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