Nurse left wound to become sore (9)
I believe the answer is:
resentful
'sore' is the definition.
(I've seen this before)
'nurse left wound' is the wordplay.
'wound' indicates an anagram (wound can mean twisted or turned around).
'nurse'+'left'='nurseleft'
'nurseleft' anagrammed gives 'RESENTFUL'.
'to become' is the link.
(Other definitions for resentful that I've seen before include "Grudging" , "Feeling indignation" , "Bitter" , "Tiny wave" , "Feeling hostile because of injury" .)