Running club train - it makes running easier (9)

I believe the answer is:

lubricant

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'it makes running easier' is the definition.
The definition suggests a singular noun which matches the answer.

'running club train' is the wordplay.
'running' is an anagram indicator (the letters run around to different places).
'club'+'train'='clubtrain'
'clubtrain' with letters rearranged gives 'LUBRICANT'.

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(Other definitions for lubricant that I've seen before include "Substance used to reduce friction" , "Substance reducing friction" , "it has a smoothing effect" , "Eg, grease" , "E.g. oil" .)

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