Is careless while filling lighters (6)

I believe the answer is:

spills

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'lighters' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I don't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for spills that I've seen before include "Pieces of rolled paper used to light a fire" , "Causes liquid to flow out" , "Pieces of rolled paper used to light fires" .)

I've seen this clue in The Globe and Mail.

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