Bottle opener vet stocks (5)
I believe the answer is:
nerve
'bottle' is the definition.
(thesaurus)
'opener vet stocks' is the wordplay.
'stocks' indicates a hidden word.
'NERVE' can be found hidden inside 'opener vet'.
(Other definitions for nerve that I've seen before include "Steel - bottle - neck" , "Sensory organ; bottle" , "Impudence; sensory fibre" , "Fibre carrying impulses from brain to body" , "presumption" .)