You might play something by this (3)
I believe the answer is:
ear
'you might play something by this' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ear that I've seen before include "Corn seed-holder" , "Fruiting head of a cereal" , "Seed-bearing part of corn" , "organ with drum" , "Lend one and listen" .)