A second carrier off right path (6)
I believe the answer is:
astray
'right path' is the definition.
Both the definition and answer are adverbs. Perhaps you can see an association between them that I don't see?
'a second carrier' is the wordplay.
'second' becomes 's' (common abbreviation).
'carrier' becomes 'tray' (I've seen this before).
'a'+'s'+'tray'='ASTRAY'
'off' is the link.
Can you help me to learn more?
(Other definitions for astray that I've seen before include "Off the right track" , "Missing, lost" , "Off the track - in error" , "Off-course" , "Off course - wrong - misled" .)