Presiding officer taking flier behind church (8)
I believe the answer is:
chairman
'presiding officer' is the definition.
(chairman is a kind of presiding officer)
'flier behind church' is the wordplay.
'flier' becomes 'airman' (synonyms).
'behind' says to put letters next to each other.
'church' becomes 'ch' (abbreviation on maps etc).
'airman' after 'ch' is 'CHAIRMAN'.
'taking' acts as a link.
(Other definitions for chairman that I've seen before include "Person presiding over a board" , "official in authority" , "Presiding officer at meetings" , "Head of the board" , "Presiding official" .)