Look at yours truly when speaking (3)
I believe the answer is:
eye
'look at' is the definition.
(I've seen this before)
'yours truly when speaking' is the wordplay.
'yours truly' becomes 'i'.
'when speaking' shows a homophone (sound like).
'i' sounds like 'EYE'.
(Other definitions for eye that I've seen before include "Ogle" , "Bit of a potato (or a needle?)" , "Dark spot on a potato" , "Oculus" , "where the pupil is seated" .)