Character caught by musket hospitalised (5)
I believe the answer is:
ethos
'character' is the definition.
(moral character)
'caught by musket hospitalised' is the wordplay.
'caught by' says the answer is hidden in the clue.
'ETHOS' can be found hidden inside 'musket hospitalised'.
(Other definitions for ethos that I've seen before include "Characteristic spirit, of a culture say" , "Distinctive spirit - character" , "The distinctive spirit of a culture or an era" , "Distinctive group spirit" , "Moral character" .)