... Church officer in charge, sort of cross (6)
I believe the answer is:
celtic
'sort of cross' is the definition.
'church officer in charge' is the wordplay.
'church' becomes 'ce' (abbreviation for Church of England).
'officer' becomes 'lt' (I've seen this in other clues).
'in charge' becomes 'ic'.
'ce'+'lt'+'ic'='CELTIC'
(Other definitions for celtic that I've seen before include "Group of languages including Irish, Welsh, etc" , "The race of ancient Gaels" , "Glasgow football club" , "Scottish club" , "Relating to Irish, Gaelic, Manx, Welsh, etc" .)