NHS staffer in north sure to be sacked (5)

I believe the answer is:

nurse

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'nhs staffer' is the definition.
I can't tell whether this defines the answer.

'north sure to be sacked' is the wordplay.
'north' becomes 'N' (abbreviation).
'to be sacked' indicates anagramming the letters.
'sure' with letters rearranged gives 'urse'.
'n'+'urse'='NURSE'

'in' is the link.

Can you help me to learn more?

(Other definitions for nurse that I've seen before include "Look after the sick" , "Trained carer" , "Runes (anag)" , "Qualified carer" , "one working in theatre" .)

I've seen this clue in The Sun.

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