He's said to go more than the distance (6)
I believe the answer is:
father
'he's said to go more than the distance' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he's said to go more' is the wordplay.
'he's said' becomes 'fat' (I can't justify this - if you can you should believe this answer much more).
'go' is a deletion indicator.
'more' becomes 'other' (synonyms).
'other' with 'to' taken out is 'her'.
'fat'+'her'='FATHER'
Can you help me to learn more?
(Other definitions for father that I've seen before include "PA" , "Patriarch" , "Old man" , "and 13: Jolly gift-deliverer" , "relation" .)