Bottle among finer vessels (5)
I believe the answer is:
nerve
'bottle' is the definition.
(thesaurus)
'among finer vessels' is the wordplay.
'among' indicates the answer is hidden within the clue.
'NERVE' is hidden in the letters of 'finer vessels'.
(Other definitions for nerve that I've seen before include "Fibre that carries instructions to the brain" , "Dangerous type of gas" , "Bundle of fibres in the body (5)" , "Sensation transmitter" , "Bottle, courage" .)