Light passion? That’s what row is about! (3,4,2)
I believe the answer is:
set fire to
'light' is the definition.
(I've seen this before)
'passion? that's what row is about' is the wordplay.
I cannot quite see how this works, but
'passion?' could be 'fire' (fire is a kind of passion) and 'fire' is present in the answer.
'row' could be 'setto' (I've seen this in another clue) and 'setto' is present in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for set fire to that I've seen before include "Ignite" , "Light" , "torch" .)