Sign and bring right back to one (5)
I believe the answer is:
trace
'sign' is the definition.
(thesaurus)
'right back to one' is the wordplay.
'right' becomes 'rt'.
'back' says the letters should be written backwards.
'to one' becomes 'ace' (synonyms).
'rt' back-to-front is 'tr'.
'tr'+'ace'='TRACE'
'and bring' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for trace that I've seen before include "Discover - modicum" , "Track down or make copy" , "Very small amount that can only just be detected" , "Detect - track" , "Smidgen" .)