Arrogant nurses see proof? (10)
I believe the answer is:
impervious
'proof?' is the definition.
('impervious' can be similar in meaning to 'proof')
'arrogant nurses see' is the wordplay.
I cannot really see how this works, but
'see' could be 'v' (Latin 'vide', used to direct a reader to a source) and 'v' is present in the answer.
'arrogant' could be 'imperious' (I've seen this before) and 'imperious' is located in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for impervious that I've seen is " impossible to pass".)