A piece from your favourite magazine? (4)
I believe the answer is:
item
'a piece' is the definition.
(I've seen this before)
'from your favourite magazine?' is the wordplay.
'from' says the answer is hidden in the clue.
'ITEM' is hidden in the letters of 'your favourite magazine'.
(Other definitions for item that I've seen before include "One article" , "See couple" , "couple linked" , "Matter" , "One thing among many" .)