Painless choice to remove caps in sanctuary (6)
I believe the answer is:
asylum
'sanctuary' is the definition.
(I know that sanctuary can be written as asylum)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for asylum that I've seen before include "Harbour" , "Place of shelter or refuge" , "Safe place of refuge" , "Shelter given to refugee" , "'Refuge, sanctuary (6)'" .)