Those disposed to show spirit (5)
I believe the answer is:
ethos
'spirit' is the definition.
(I've seen this before)
'those disposed' is the wordplay.
'disposed' indicates an anagram.
'those' is an anagram of 'ETHOS'.
'to show' is the link.
(Other definitions for ethos that I've seen before include "Society values" , "Distinctive group attitudes" , "Spirit (of an age/culture)" , "The distinctive spirit of a culture or an era" , "Characteristic spirit of a culture or era" .)