Face coverings king used in church service (5)
I believe the answer is:
masks
'face coverings' is the definition.
'masks' can be an answer for 'coverings' (mask is a kind of covering). I am unsure of the 'face' bit.
'king used in church service' is the wordplay.
'king' becomes 'K' (chess abbreviation).
'used in' means one lot of letters goes inside another.
'church service' becomes 'mass' (Mass is a type of church service).
'k' placed inside 'mass' is 'MASKS'.
Can you help me to learn more?
(Other definitions for masks that I've seen before include "Coverings to conceal the face" , "Hides, disguises" .)