Crossword Genius

Runs with, in shorts (5)

Ross

I believe the answer is:

fuses

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'runs' is the definition.
(fusing is a kind of running)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for fuses that I've seen before include "Circuit breakers" , "Blends together as with heat" , "Electrical safety devices" , "They interrupt the electric current when they're overloaded" , "Blends or amalgamates, say metals" .)

I've seen this clue in the Evening Standard.
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