Hurried round to betray (3,2)
I believe the answer is:
rat on
'betray' is the definition.
('rat on' can be a synonym of 'betray')
'hurried round to' is the wordplay.
'hurried' becomes 'ran' (running is a kind of hurrying).
'round' indicates putting letters inside.
'ran' going around 'to' is 'RAT ON'.
(Other definitions for rat on that I've seen before include "grass up" , "desert" , "shop" , "Give away" , "Betray" .)