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' says to take the initial letters.
'resource' becomes 'asset' (I've seen this in another clue).
The first letter of 'baskervilles' 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" .)