Managed to stay in and inform (3,2)
I believe the answer is:
rat on
'inform' is the definition.
(ratting on is a kind of informing)
'managed to stay in' is the wordplay.
I cannot really see how this works, but
'to' is found in the answer.
'managed' could be 'ran' (I've seen this before) and 'ran' is found in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for rat on that I've seen before include "desert" , "grass up" , "Give away" , "shop" , "Betray" .)