Tailor appears to have heard of hair (10)
I believe the answer is:
seamstress
'tailor' is the definition.
(I know that seamstress is a type of tailor)
'heard of hair' is the wordplay.
'heard of' becomes 'seams' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hair' becomes 'tress' (tress is a kind of hair).
'seams'+'tress'='SEAMSTRESS'
'appears to have' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for seamstress that I've seen before include "sewer" , "Dressmaker" , "Woman who sews for a living" , "Midinette" , "needlewoman" .)