Dog fit to be not beyond help (7)

I believe the answer is:

curable

I'm a little stuck... Click here to teach me more about this clue!

'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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.