Gold pens hide fiction (7)
I believe the answer is:
stories
'fiction' is the definition.
'gold pens hide' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'pens' becomes 'sties' (sty is a kind of pen).
'hide' means one lot of letters goes inside another.
'or' placed into 'sties' is 'STORIES'.
(Other definitions for stories that I've seen before include "See 12" , "Floors" , "For example, scoops" , "See 21" , "Tales" .)