Some extra illuminated track (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
trail
'track' is the definition.
(I've seen this before)
'some extra illuminated' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TRAIL' is hidden in the letters of 'extra illuminated'.
(Other definitions for trail that I've seen before include "Stalk" , "Rough track blazed through wild or hilly country" , "Straggle" , "Follow - track" , "Get behind" .)