Change and collect one’s wits before church (6)
I believe the answer is:
switch
'change' is the definition.
(switch is a kind of change)
'collect one's wits before church' is the wordplay.
I cannot really understand how this works, but
an anagram of 'wits' is 'swit' which is within the answer.
'church' could be 'ch' (common abbreviation) and 'ch' is present in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for switch that I've seen before include "Device for opening or closing a circuit" , "Divert the electrical control" , "turn" , "Change or exchange" , "Circuit-breaker" .)