Crossword Genius

Running might burn it? (3)

Ross

I believe the answer is:

fat

I'm a little stuck... Click here to teach me more about this clue!

'running might' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'burn it?' is the wordplay.
'burn' becomes 'fa' (I can't justify this - if you can you should give a lot more credence to this answer).
'fa'+'t'='FAT'

Can you help me to learn more?

(Other definitions for fat that I've seen before include "and 24: Overpaid City type" , "Obese, having spare tyre etc" , "Like 10 ac" , "Adipose tissue" , "Substantial" .)

I've seen this clue in the Evening Standard.
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