It’s unlike him to be late at work (7)
I believe the answer is:
milkman
'it's unlike him to be late at work' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'him to be late at work' is the wordplay.
'him' becomes 'man'.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'be late at work' becomes 'milk' (I can't justify this - if you can you should believe this answer much more).
'man' put after 'milk' is 'MILKMAN'.
Can you help me to learn more?
(Other definitions for milkman that I've seen before include "Morning deliverer" , "Pinta deliverer" , "Deliverer of dairy products" , "Man in charge of a float" , "Float driver" .)