Coach leaves with singer (7)
I believe the answer is:
teacher
'coach' is the definition.
(I've seen this before)
'leaves with singer' is the wordplay.
'leaves' becomes 'tea' (as in tea leaves).
'with' says to put letters next to each other.
'singer' becomes 'cher' (American singer).
'tea'+'cher'='TEACHER'
(Other definitions for teacher that I've seen before include "Tutor" , "Mentor" , "Cheater (anag.)" , "supply?" , "Master" .)