Lots confining a pig in a wood (8)
I believe the answer is:
mahogany
'a wood' is the definition.
(I know that mahogany is a type of hardwood)
'lots confining a pig' is the wordplay.
'lots' becomes 'many' (many means lots of something).
'confining' means one lot of letters goes inside another.
'pig' becomes 'hog' (synonyms).
'a'+'hog'='ahog'
'many' going around 'ahog' is 'MAHOGANY'.
'in' is the link.
(Other definitions for mahogany that I've seen before include "Reddish-brown hardwood" , "Type of wood" , "Wooden" , "Log" , "Hogmanay? (anag)" .)