Goes easy on (6)
I believe the answer is:
spares
'goes easy on' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for spares that I've seen before include "Is merciful towards, refrains from hurting" , "Extras in case of necessity" , "Extras with spears" , "Lets off; reserve parts" , "Replacement items, like tyres" .)