One walker or another failing to start (6)
I believe the answer is:
ambler
'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" .)