Points to part of engine (6)
I believe the answer is:
piston
'engine' is the definition.
(thesaurus)
'points to part' is the wordplay.
'to part' is an anagram indicator (I've seen 'parts of' mean this).
'points' with letters rearranged gives 'PISTON'.
'of' is the link.
(Other definitions for piston that I've seen before include "Mechanical plunger" , "Part of internal combustion engine" , "Transmitter of motion from camshaft to valve" , "Brass instrument's valve" , "Mechanical device that has a thrusting motion" .)