"Little piggy" that went to market (3,3)
I believe the answer is:
big toe
'little piggy that went to market' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for big toe that I've seen before include "that once went to market?" , "Largest foot digit" , "member of the body" , "Largest pedal extremity" , "Corn grows here" .)