Faith of one distributing alms (5)
I believe the answer is:
islam
'faith' is the definition.
(Islam is an example)
'one distributing alms' is the wordplay.
'one' becomes 'i' (Roman numeral).
'distributing' indicates an anagram.
'alms' is an anagram of 'slam'.
'i'+'slam'='ISLAM'
'of' is the link.
(Other definitions for islam that I've seen before include "Religion based on Muhammad's teachings" , "Adherents of a religion" , "Monotheistic religion" , "Mails to great eastern religion" , "Mails to Muslim religion" .)