Sterilised wound looking neat (5-3)
I believe the answer is:
clean-cut
'looking neat' is the definition.
'sterilised wound' is the wordplay.
'sterilised' becomes 'clean'.
'wound' becomes 'cut' (cut is a kind of wound).
'clean'+'cut'='CLEAN-CUT'
(Other definitions for clean-cut that I've seen before include "Handsome, with features sharply outlined" , "With a neat, respectable appearance" , "Appearing neat and respectable (of a man)" , "Well groomed" , "Tidy and respectable" .)