Crossword Genius

One walker or another failing to start (6)

Ross

I believe the answer is:

ambler

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

'one walker' is the definition.
(I've seen this before)

'another failing to start' is the wordplay.
I cannot really see how this works, but
'another' could be 'r' (I've seen this in other clues) and 'r' is found within the answer.
The remaining letters 'amble' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'or' acts as a link.

Can you help me to learn more?

(Other definitions for ambler that I've seen before include "Horse" , "Walker who's rather slow" , "toddler?" , "one moving slowly" , "English thriller writer; walker" .)

I've seen this clue in The Telegraph.
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