Cross river with one sort of light (5)
I believe the answer is:
riled
'cross' is the definition.
(I've seen this before)
'river with one sort of light' is the wordplay.
'river' becomes 'ri' (I can't justify this - if you can you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'one sort of light' becomes 'led' (light emitting diode).
'ri'+'led'='RILED'
Can you help me to learn more?
(Other definitions for riled that I've seen before include "Irritated, provoked" , "Vexed" , "Cross" , "Made angry" , "Nettled" .)