I travel on trail that's glittering (10)
I believe the answer is:
iridescent
'glittering' is the definition.
(I know this)
'i travel on trail' is the wordplay.
'travel on' becomes 'ride' (I've seen this before).
'trail' becomes 'scent' (an animal's trail is its scent).
'i'+'ride'+'scent'='IRIDESCENT'
'that's' acts as a link.
(Other definitions for iridescent that I've seen before include "with a glittering display" , "Shimmering with rainbow colours (anag of 1 across, 9 and 23)" , "Showing luminous colours" , "shimmering with colour" , "Eye-catching" .)