I travel over track, shimmering (10)

I believe the answer is:

iridescent

I'm a little stuck... Click here to teach me more about this clue!

'shimmering' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'i travel over track' is the wordplay.
'travel' becomes 'ride' (eg to ride a bus).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'track' becomes 'scent' (both can mean a trace left by someone).
'i'+'ride'+'scent'='IRIDESCENT'

Can you help me to learn more?

(Other definitions for iridescent that I've seen before include "Eye-catching" , "Sparkling" , "changing colour" , "shimmering with colour" , "flashing colours" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.