Baskerville's capital resource — a hound (6)
I believe the answer is:
basset
'a hound' is the definition.
(basset hound is an example)
'baskerville's capital resource' is the wordplay.
'capital' suggests taking the first letters.
'resource' becomes 'asset' (I've seen this in another clue).
The initial letter of 'baskerville' is 'b'.
'b'+'asset'='BASSET'
(Other definitions for basset that I've seen before include "Smooth-haired, long-eared hound" , "Type of hound" , "Hound (named Fred?)" , "Short-legged dog" , "Low, smooth-haired breed of hound" .)