Less of a burden than a box of matches? (7)
I believe the answer is:
lighter
'matches?' is the definition.
(matches is a kind of lighter)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for lighter that I've seen before include "Device for igniting cigarette" , "Less weighty" , "Boat for heavy loads and fire igniter" , "Tender, launch" , "Vessel" .)