Those drunk on spirit (5)
I believe the answer is:
ethos
'spirit' is the definition.
(I've seen this before)
'those drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'those' with letters rearranged gives 'ETHOS'.
'on' is the link.
(Other definitions for ethos that I've seen before include "Those with characteristic beliefs or spirit" , "Underlying culture of a group" , "Cultural spirit" , "Moral significance" , "Group's distinctive character" .)