He has a casual sort of shirt with his new suit (5)
I believe the answer is:
titus
This could be a double definition.
'he' is the first definition.
'a casual sort of shirt with his new suit' is the second definition.
The definition suggests a singular noun which matches the answer.
'has' acts as a link.
Can you help me to learn more?
(Other definitions for titus that I've seen before include "Groan, say" , "-- Groan, novel by Mervyn Peake" , "Roman emperor from AD79" , "saint" , "recipient of holy letter" .)