Spot note about hospital, become very angry (6)
I believe the answer is:
seethe
'angry' is the definition.
(I've seen this before)
'spot note about hospital become' is the wordplay.
I cannot really see how this works, but
'spot' could be 'see' (both can mean to notice or observe) and 'see' is found within the answer.
'note' could be 'e' (musical note) and 'e' is found in the answer.
'hospital' could be 'h' (abbreviation for hospital) and 'h' is found within the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'very' acts as a link.
Can you help me to learn more?
(Other definitions for seethe that I've seen before include "Be extremely angry" , "Barely contain one's anger" , "be incensed" , "Steep - surge" , "Ferment, sizzle" .)