Recalled best mark (4)
I believe the answer is:
spot
'mark' is the definition.
(spotting is a kind of marking)
'recalled best' is the wordplay.
'recalled' shows that the letters should be reversed in order.
'best' becomes 'tops'.
'tops' backwards is 'SPOT'.
(Other definitions for spot that I've seen before include "Small mark or stain" , "precise location" , "Sight - site" , "clock" , "Lady Macbeth: ''Out, damned . . . .!''" .)