Superman initially bends metal in foul mood (4)

I believe the answer is:

snit

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'foul mood' is the definition.
(I've seen this in another clue)

'superman initially bends metal' is the wordplay.
'initially' indicates taking the first letters.
'bends metal' becomes 'nit' (I can't explain this - if you can you should give a lot more credence to this answer).
The initial letter of 'superman' is 's'.
's'+'nit'='SNIT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for snit that I've seen before include "fit of temper" , "State of agitated irritation" , "American sulks" , "Sulking" .)

I've seen this clue in the Sydney Morning Herald.

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