Justifiable reasons for the dregs (7)

I believe the answer is:

grounds

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This could be a double definition.

'justifiable reasons' is the first definition.
'grounds' can be an answer for 'reasons' (grounds or reasons for an action). I'm not sure about the 'justifiable' bit.

'the dregs' is the second definition.
(synonyms)

'for' acts as a link.

Can you help me to learn more?

(Other definitions for grounds that I've seen before include "justification" , "Coffee sediment" , "Reasons" , "enclosure around house" , "Area of enclosed land around a building" .)

I've seen this clue in The Irish Independent.

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