Amuse the titular head with a Verdi composition (6)
I believe the answer is:
divert
'amuse' is the definition.
(synonyms)
'titular head with a verdi composition' is the wordplay.
'head' says to take the initial letters.
'with' says to put letters next to each other.
'composition' indicates anagramming the letters (letters arranged or composed in a different order).
The initial letter of 'titular' is 't'.
'verdi' with letters rearranged gives 'diver'.
't' put after 'diver' is 'DIVERT'.
'the' acts as a link.
(Other definitions for divert that I've seen before include "Distract" , "Send in another direction, or entertain" , "Entertain; reroute" , "Amuse or send in another direction" , "Entertain; reallocate" .)