Very small amounts of facial hair (8)
I believe the answer is:
whiskers
'facial hair' is the definition.
(I've seen this before)
'very small amounts' is the wordplay.
I cannot really see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is found in the answer.
'amounts' could be 'rs' (R is an example) and 'rs' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for whiskers that I've seen before include "Facial hair" , "Face-hairs" , "See 2" , "Face-hair" , "Face fungus" .)