Leaving the job for rail builders to do (6,6)

'leaving' is the definition.
(to make tracks is to depart)

'job for rail builders to do' is the wordplay.
I cannot really see how this works, but
'rail' could be 'track' (synonyms) and 'track' is found in the answer.
The remaining letters 'makings' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'the' acts as a link.