Gets along without replacement items (6)
I believe the answer is:
spares
This clue is a double definition.
'gets along without' is the first definition.
(to spare something is to do without it)
'replacement items' is the second definition.
(spare items)
(Other definitions for spares that I've seen before include "Extras with spears" , "Is merciful towards, refrains from hurting" , "Replacement items, like tyres" , "Lets off; reserve parts" , "Extras in case of necessity" .)