Chap has school in the morning (3)
I believe the answer is:
sam
'chap' is the definition.
(man's name)
'school in the morning' is the wordplay.
'school' becomes 'S'.
'in the morning' becomes 'am' (short for ante meridiem - before noon).
's'+'am'='SAM'
'has' is the link.
(Other definitions for sam that I've seen before include "Casablanca piano player" , "Boy" , "together once" , "Uncle" .)