Whiskers under the nose and on the back of a goat (6)
I believe the answer is:
mohair
'on the back of a goat' is the definition.
I can't tell whether this definition defines the answer.
'whiskers under the nose' is the wordplay.
'whiskers' becomes 'hair' (I've seen this before).
'under' says to put letters next to each other.
'the nose' becomes 'mo' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hair' put after 'mo' is 'MOHAIR'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for mohair that I've seen before include "Fine silky coat of angora goat" , "coat required" , "Fine silky wool of the angora goat" , "Fabric from coating of angora goat" , "Cloth made from wool of angora goat" .)