Possibly it can run out of bombs (6)

I believe the answer is:

petrol

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'of bombs' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for petrol that I've seen before include "Gasoline" , "Fuel for road vehicles" , "Fuel for the internal combustion engine" , "Mineral oil refined as fuel" , "The juice" .)

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