Line up on left coming back, he cries (6)
I believe the answer is:
yeller
'back he cries' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'line up on left' is the wordplay.
'line' becomes 'ley' (as in ley lines).
'up' becomes 'rel' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'left' says the letters should be written in reverse.
'ley' put after 'rel' is 'relley'.
'relley' written backwards gives 'YELLER'.
'coming' is the link.
Can you help me to learn more?
(Another definition for yeller that I've seen is " one making a lot of noise".)