Cover for church leader in matter I brought up (7)
I believe the answer is:
biretta
'cover for church leader' is the definition.
(hat worn by some Catholic clergymen)
'in matter i brought up' is the wordplay.
'in' indicates a hidden word.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'atterib' is hidden in the letters of 'matter i brought'.
'atterib' back-to-front is 'BIRETTA'.
(Other definitions for biretta that I've seen before include "Stiff clerical cap" , "Square cap worn by Roman Catholic clergy" , "Battier (anag.)" , "Cardinal's red cap" , "Cloth cap" .)