Signs I'd put out for track runners needing a rest (7)
I believe the answer is:
'track runners needing a rest' is the definition.
I can't judge whether this definition defines the answer.
'signs i'd put out' is the wordplay.
'put out' indicates anagramming the letters.
'signsid' anagrammed gives 'SIDINGS'.
'for' is the link.
Can you help me to learn more?
(Another definition for sidings that I've seen is " railway stores".)