Best director of 1986 and 1989 (5)
I believe the answer is:
stone
'best director of 1986 and 1989' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stone that I've seen before include "Rock; gem" , "Hard lump of mineral matter" , "diamond, say" , "Rag" , "Small rock" .)