Composer taking a graduate to church (4)
I believe the answer is:
bach
'composer' is the definition.
(Johann Sebastian Bach)
'a graduate to church' is the wordplay.
'a graduate' becomes 'ba' (someone with a Bachelor of Arts degree).
'to church' becomes 'ch' (abbreviation on maps etc).
'ba'+'ch'='BACH'
'taking' acts as a link.
(Other definitions for bach that I've seen before include "Johann Sebastian . . . ., great 18th century German composer" , "German baroque composer, d. 1750" , "Welsh term of endearment" , "Musical family" , "Brandenburg Concertos composer, d. 1750" .)