Spot inexperienced driver cutting speed (5)
I believe the answer is:
place
'spot' is the definition.
(I know that spot can be written as place)
'inexperienced driver cutting speed' is the wordplay.
'inexperienced driver' becomes 'l' (as in L-plates for learner drivers).
'cutting' means one lot of letters goes inside another (some letters cut their way into a word).
'speed' becomes 'pace' (pace is a kind of speed).
'l' placed inside 'pace' is 'PLACE'.
(Other definitions for place that I've seen before include "Site" , "Location; put" , "Locality" , "Locus" , "vacancy" .)