Amber for instance about to stray from path (5)
I believe the answer is:
resin
'amber for instance' is the definition.
(I've seen this in another clue)
'about to stray from path' is the wordplay.
'about' becomes 're' (regarding).
'to stray from path' becomes 'sin'.
're'+'sin'='RESIN'
(Other definitions for resin that I've seen before include "Myrrh, for instance" , "Substance from tree-sap" , "Sticky tree exudation" , "Origin of amber" , "Organic polymer used in varnishes, adhesives etc." .)