Notes the bit to leave (6)
I believe the answer is:
depart
'leave' is the definition.
(synonyms)
'notes the bit' is the wordplay.
'notes' becomes 'de'.
'the bit' becomes 'part' (I've seen this in other clues).
'de'+'part'='DEPART'
'to' is the link.
(Other definitions for depart that I've seen before include "Prated (anag.)" , "Quit" , "Stray" , "Petard (anag.)" , "Leave, vanish" .)