Enterprising and innovative vet's demeanour (13)
I believe the answer is:
adventuresome
'enterprising' is the definition.
(associated in meaning)
'innovative vet's demeanour' is the wordplay.
'innovative' is an anagram indicator.
'vets'+'demeanour'='vetsdemeanour'
'vetsdemeanour' is an anagram of 'ADVENTURESOME'.
'and' is the link.
(Other definitions for adventuresome that I've seen before include "Daring and enterprising" , "Ready to incur risk" , "Ready to take risks" , "taking risks" , "Rather daring arrival" .)