Human organ with its own immune system (3)
I believe the answer is:
eye
(Other definitions for eye that I've seen before include "potato bud" , "centre, of a sort" , "Bit of a potato (or a needle?)" , "Symmetrical spot" , "9 across village" .)
I believe the answer is:
eye
(Other definitions for eye that I've seen before include "potato bud" , "centre, of a sort" , "Bit of a potato (or a needle?)" , "Symmetrical spot" , "9 across village" .)