Exhaust all resources to make the room secure? (5,4,4)
I believe the answer is:
shoot ones bolt
'exhaust all resources to' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'the room secure?' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'secure?' could be 'bolt' (I've seen this in another clue) and 'bolt' is present in the answer.
This explanation may well be incorrect...
'make' is the link.
Can you help me to learn more?
(Other definitions for shoot ones bolt that I've seen before include "Do all in one's power" , "achieve security" .)