Attend religious area with Democrat, get exhausted (2,2,4)
I believe the answer is:
go to seed
'get exhausted' is the definition.
I can't tell whether this definition defines the answer.
'attend religious area with democrat' is the wordplay.
'attend' becomes 'goto' (synonyms).
'religious area' becomes 'see' (a 'see' is the location of a cathedral).
'with' means one lot of letters go next to another.
'democrat' becomes 'd'.
'goto'+'see'+'d'='GO TO SEED'
Can you help me to learn more?
(Other definitions for go to seed that I've seen before include "Lose power" , "Decline" , "Deteriorate through neglect" , "move in with children?" , "Not look after oneself" .)