Killjoy (10)
'killjoy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for puritan that I've seen before include "One forgoing pleasure" , "Member of a group of English Protestants who thought that the Protestant Reformation was incomplete" , "Strait-laced" , "Killjoy" , "Strict person for whom pleasure is sinful" .)
'killjoy' is the definition.
(I know that killjoy can be written as spoilsport)
This is all the clue.
(Other definitions for spoilsport that I've seen before include "misery" , "One who won't play?" , "Party pooper" , "Party-pooper" , "One who reduces others' pleasure" .)