Yonder thing (4)
I believe the answer is:
that
'yonder thing' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for that that I've seen before include "Take ..., English pop band" , "Yon" , "Just like --; -- is to say" , "Not 8 Ac but the other" , "The (one) there" .)