Dog and pig's clothing ripped off (6)
I believe the answer is:
shadow
'dog' is the definition.
(I've seen this before)
'pig's clothing ripped off' is the wordplay.
'pig' becomes 'sow' (I've seen this in another clue).
'clothing' means one lot of letters goes inside another (some letters cover up or clothe others).
'ripped off' becomes 'had' (I can't justify this - if you can you should give a lot more credence to this answer).
'sow' going around 'had' is 'SHADOW'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for shadow that I've seen before include "Dark area - follow secretly" , "Image cast - dog" , "Darkness caused by obstruction" , "Opposer" , "Ghost" .)