Accommodate strongbox before secret location (4,5)
I believe the answer is:
safe house
'secret location' is the definition.
I know nothing about this answer so I can't tell whether this works.
'accommodate strongbox before' is the wordplay.
'accommodate' becomes 'house' (I've seen this before).
'strongbox' becomes 'safe' (safe is a kind of strongbox).
'before' means one lot of letters go next to another.
'house' after 'safe' is 'SAFE HOUSE'.
Can you help me to learn more?
(Other definitions for safe house that I've seen before include "Place used secretly as a refuge" , "Secure hiding place" .)