That group shows spirit, first to last (5)
I believe the answer is:
those
'that group' is the definition.
(that group of things or people)
'spirit first to last' is the wordplay.
'spirit first' becomes 'hose' (I can't justify this - if you can you should give a lot more credence to this answer).
'to' says to put letters next to each other (I've seen this in other clues).
'last' becomes 't' (I've seen this in other clues).
'hose' after 't' is 'THOSE'.
'shows' acts as a link.
Can you help me to learn more?
(Other definitions for those that I've seen before include "Ethos (anag.)" , "the more far out?" , "Nostalgic utterance" , "The ones farther away" , "Plural form of that" .)