Filter last of results in front of coach (8)
I believe the answer is:
strainer
'filter' is the definition.
(strainer is a kind of filter)
'last of results in front of coach' is the wordplay.
'last of' says to take the final letters.
'in front of' is a charade indicator (letters next to each other).
'coach' becomes 'trainer' (I've seen this before).
The last letter of 'results' is 's'.
's'+'trainer'='STRAINER'
(Other definitions for strainer that I've seen before include "device to catch leaves" , "One trying very hard" , "something for tea" , "Person making too much effort" , "riddle?" .)