Attend a sanctuary, and withdraw (4,1,7)
I believe the answer is:
beat a retreat
'withdraw' is the definition.
(I've seen this before)
'attend a sanctuary' is the wordplay.
'attend' becomes 'beat' (I've seen this in other clues).
'sanctuary' becomes 'retreat' (I've seen this before).
'beat'+'a'+'retreat'='BEAT A RETREAT'
'and' is the link.
(Other definitions for beat a retreat that I've seen before include "Go away in a hurry" , "Withdraw quickly" , "Retire hastily" , "Withdraw to avoid something unpleasant" , "Depart hastily" .)