Support for others (4)
I believe the answer is:
rest
This clue is a double definition.
'support' is the first definition.
(e.g. a shoulder rest is a support for shoulder)
'others' is the second definition.
(eg the rest of a group)
'for' acts as a link.
(Other definitions for rest that I've seen before include "idle" , "still holding it" , "Remainder; be inactive" , "Remainder; relax" , "Relax, take a break" .)