Pound in Fez rarely seen (4)
I believe the answer is:
ezra
'pound' is the definition.
(I've seen this in another clue)
'in fez rarely seen' is the wordplay.
'in' indicates a hidden word.
'EZRA' can be found hidden inside 'fez rarely seen'.
(Other definitions for ezra that I've seen before include "OT prophet" , "Fifteenth book of the Old Testament" , "Biblical priest" , "-- Pound, US poet and critic 1885-1972" , "Book after II Chronicles" .)