Concerned with us, sprites supply us (9)
I believe the answer is:
ourselves
'us' is the definition.
(us refers to ourselves)
'concerned with us sprites' is the wordplay.
I cannot quite understand how this works, but
'sprites' could be 'elves' (elf is a kind of sprite) and 'elves' is present in the answer.
The remaining letters 'ours' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'supply' is the link.
Can you help me to learn more?
(Other definitions for ourselves that I've seen before include "See 16" , "Emphatically us" , "Us, reflexively" , "We or us personally" .)