Runners carry it along (6)
I believe the answer is:
sledge
'runners carry it along' is the definition.
I can't judge whether this defines the answer.
'runners carry it along' is the wordplay.
'runners carry it' becomes 'sled' (I've seen this in another clue).
'along' becomes 'ge' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sled'+'ge'='SLEDGE'
Can you help me to learn more?
(Other definitions for sledge that I've seen before include "Narrow cart with runners for travelling on snow" , "Sleigh" , "Heavy long-handled hammer" , "Vehicle on runners, for snow and ice" , "Large heavy hammer" .)