Light to carry (5)
I believe the answer is:
torch
This clue could be a double definition.
'light' is the first definition.
(type of light)
'carry' is the second definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'to' acts as a link.
Can you help me to learn more?
(Other definitions for torch that I've seen before include "Burn maliciously" , "source of enlightenment" , "Portable light; burn" , "may get one glowing" , "Set fire to (something)" .)