Spot on, precise (5)
I believe the answer is:
exact
I believe this clue is a double definition.
'spot on' is the first definition.
(spot on means exactly right)
'precise' is the second definition.
(I know that precise can be written as exact)
(Other definitions for exact that I've seen before include "Faithful" , "Finished" , "Strict" , "Rigorous" , "Explicit" .)