Hairy spider's ending in drink (8)
I believe the answer is:
'hairy' is the definition.
(I've seen this before)
'spider's ending in drink' is the wordplay.
'spider's ending' becomes 'er' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'drink' becomes 'whisky' (whisky is a kind of drink).
'er' placed inside 'whisky' is 'WHISKERY'.
Can you help me to learn more?
(Other definitions for whiskery that I've seen before include "Hairy" , "Bearded" , "mutton chops" , "With facial hair" .)