Most of the fleece, top, dress and cast-off in the outhouse (8)
I believe the answer is:
woodshed
'the outhouse' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'most of the fleece top dress and cast-off' is the wordplay.
'most of' means to remove the last letter.
'the fleece' becomes 'wool' ('wool' can be a synonym of 'fleece').
'top dress' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'cast off' becomes 'shed' ('shed' can be a synonym of 'cast off').
'wool' with its final letter removed is 'woo'.
'woo'+'d'+'shed'='WOODSHED'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for woodshed that I've seen before include "practise in private" , "outbuilding" , "Log store" , "Logs in here" , "Where there's something nasty?" .)