Is it lunchtime at the pub that he sings? (8)
I believe the answer is:
baritone
'he sings?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'is it lunchtime at the pub' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'lunchtime' could be 'i' (one o'clock is I on a clock with Roman numerals) and 'i' is present in the answer.
'at' could be 'on' (location) and 'on' is found in the answer.
'pub' could be 'bar' (both are drinking establishments) and 'bar' is located in the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'that' is the link.
Can you help me to learn more?
(Other definitions for baritone that I've seen before include "Male singer between tenor and bass" , "Second lowest male singing voice" , "Male voice with deep register" , "solo voice" , "Male voice between bass and tenor" .)