Leave without scarf (5)
I believe the answer is:
exeat
'leave' is the definition.
(I've seen this before)
'without scarf' is the wordplay.
'without' becomes 'ex' (I've seen this in other clues).
'scarf' becomes 'eat' (I've seen this in another clue).
'ex'+'eat'='EXEAT'
(Other definitions for exeat that I've seen before include "Permit for absence" , "Permission for absence from school" , "permission to leave" , "Leave of absence" , "Permission to go" .)