Hear you can finally flee (3)
I believe the answer is:
run
'flee' is the definition.
(to flee is to run away)
'hear you can finally' is the wordplay.
'finally' indicates one should take the final letters.
The final letters of 'hear you can' are 'RUN'.
(Other definitions for run that I've seen before include "Take flight" , "On the . . . - fleeing from pursuit" , "stand" , "Organize" , "Scarper" .)