He wouldn't have put food out for the Crusaders! (7)
I believe the answer is:
saladin
'he wouldn't have put food out for the crusaders' is the definition.
The definition suggests a singular noun which matches the answer.
'he wouldn't have' is the wordplay.
'he' becomes 'Sal'.
'wouldn't have' becomes 'adin' (I am not sure about this - if you are sure you should believe this answer much more).
'sal'+'adin'='SALADIN'
Can you help me to learn more?
(Other definitions for saladin that I've seen before include "Opponent of the crusaders" , "Crusade warrior" , "Richard's opponent" , "Richard the Lionheart's Crusade opponent" , "Saracen leader" .)