Circuit of track friend recalled (3)
I believe the answer is:
lap
'circuit of track' is the definition.
(I've seen this before)
'friend recalled' is the wordplay.
'friend' becomes 'pal' (pal is a kind of friend).
'recalled' says the letters should be written in reverse.
'pal' in reverse letter order is 'LAP'.
(Other definitions for lap that I've seen before include "place for small computer?" , "One complete circuit" , "Single circuit of track" , "Round in a race" , "Circuit of racetrack" .)