Man advancing by single steps north on foot (4)

I believe the answer is:
pawn
'man advancing by single steps' is the definition.
'pawn' can be an answer for 'man' (man can mean a chess piece). I am not certain of the 'advancing by single steps' bit.
'north on foot' is the wordplay.
'north' becomes 'N' (abbreviation).
'on' means one lot of letters go next to another.
'foot' becomes 'paw' (paw is a kind of foot).
'n' put after 'paw' is 'PAWN'.
Can you help me to learn more?
(Other definitions for pawn that I've seen before include "Person one used" , "one used by another" , "Insignificant player" , "Chess piece -- puppet" , "making deposit for a loan" .)
