Charge on time and distance (4)
I believe the answer is:
feet
'distance' is the definition.
'charge on time' is the wordplay.
'charge' becomes 'fee' (fee is a kind of charge).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'time' becomes 't' (abbreviation).
'fee'+'t'='FEET'
'and' is the link.
(Other definitions for feet that I've seen before include "Paws" , "Old measures - that fill shoes" , "supporters?" , "Linear Units of a third of a yard" , "Imperial units of length" .)