Crossword Genius

Dog fit to be not beyond help (7)

Ross

I believe the answer is:

curable

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'be not beyond help' is the definition.
I can't tell whether this defines the answer.

'dog fit' is the wordplay.
'dog' becomes 'cur' (cur is a kind of dog).
'fit' becomes 'able' ('able' can be similar in meaning to 'fit').
'cur'+'able'='CURABLE'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for curable that I've seen before include "suitable for smoking?" , "Able to be made healthy" , "Responsive to treatment" .)

I've seen this clue in the Evening Standard.
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