Temp crazy American cut? I don't know what to say! (5)

I believe the answer is:

locum

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'temp' is the definition.
(I have seen 'Professional temp' mean 'locum' so perhaps 'temp' could also mean 'locum')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for locum that I've seen before include "Temporary replacement doctor" , "Temporary deputy for doctor" , "Deputising doctor" , "one won't be in position for ever!" , "Doctor's deputy" .)

I've seen this clue in The Independent.

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