He alone gives a wider tour of the town centre (7)
I believe the answer is:
widower
'he alone' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a wider tour of the town centre' is the wordplay.
'tour of' is an insertion indicator.
'the town centre' becomes 'ow' (central letters of the word 'town').
'wider' enclosing 'ow' is 'WIDOWER'.
'gives' is the link.
Can you help me to learn more?
(Other definitions for widower that I've seen before include "Man whose wife has died" , "Man who has lost his wife" , "Male relict" , "Bereaved man" , "One who has lost wife" .)