Test acid user, possibly given a quick fix? (12)
I believe the answer is:
resuscitated
'given a quick fix?' is the definition.
'test acid user possibly' is the wordplay.
'possibly' indicates an anagram.
'test'+'acid'+'user'='testaciduser'
'testaciduser' is an anagram of 'RESUSCITATED'.
(Other definitions for resuscitated that I've seen before include "Brought back to consciousness" , "brought round" .)