Feel free to run away (4)
I believe the answer is:
flee
'run away' is the definition.
(thesaurus)
'feel free' is the wordplay.
'free' indicates anagramming the letters.
'feel' anagrammed gives 'FLEE'.
'to' acts as a link.
(Other definitions for flee that I've seen before include "Maybe escape" , "Run (from danger)" , "head for the hills" , "retreat" , "Leave" .)