Going to church, headgear provides a certain cover (5)
I believe the answer is:
hatch
'a certain cover' is the definition.
'hatch' can be an answer for 'cover' (thesaurus). I am unsure of the 'a certain' bit.
'going to church headgear' is the wordplay.
'going to' says to put letters next to each other.
'church' becomes 'ch' (common abbreviation).
'headgear' becomes 'hat' (hats are a type of headgear).
'ch' after 'hat' is 'HATCH'.
'provides' acts as a link.
Can you help me to learn more?
(Other definitions for hatch that I've seen before include "Draw fine lines" , "Opening < car" , "Incubate - plan" , "Deck opening; (egg) open" , "Breed" .)