Supplements, with "out" (4)
I believe the answer is:
ekes
'supplements with out' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ekes that I've seen before include "Makes supplies last longer" , "Rab C's extras" , "...out a living, barely makes do" , "- - out: stretches" , "Lengthens (out)" .)