Dinkiest car set has best racing position (6,5)
I believe the answer is:
inside track
'best racing position' is the definition.
'inside track' can be an answer for 'position' (I have seen 'Advantageous position' mean 'inside track' so perhaps 'position' could also mean 'inside track'). I am unsure of the 'best racing' bit.
'dinkiest car set' is the wordplay.
'set' indicates an anagram (instruction to set the letters).
'dinkiest'+'car'='dinkiestcar'
'dinkiestcar' is an anagram of 'INSIDE TRACK'.
'has' acts as a link.
Can you help me to learn more?
(Other definitions for inside track that I've seen before include "last song on the LP?" , "Most advantageous side of race course" , "Advantageous position" , "In a position of advantage" .)