One who looks for your comments (3-6)
I believe the answer is:
lip-reader
'looks for your comments' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'li' (I've seen this in other clues) and 'li' is found within the answer.
This explanation may well be incorrect...
'who' is the link.
Can you help me to learn more?
(Another definition for lip-reader that I've seen is " Person interpreting from mouth movements".)