Losing head in fear before release though it's faultless (5-4)
I believe the answer is:
error-free
'it's faultless' is the definition.
(I've seen this before)
'losing head in fear before release' is the wordplay.
'losing head in fear' becomes 'error' (I can't justify this - if you can you should believe this answer much more).
'before' is a charade indicator (letters next to each other).
'release' becomes 'free' (synonyms).
'error'+'free'='ERROR-FREE'
'though' is the link.
Can you help me to learn more?
(Other definitions for error-free that I've seen before include "Faultless" , "Without mistakes" .)