Trendy woman started fruit (7)
I believe the answer is:
rosehip
'fruit' is the definition.
(fruit of a rose plant)
'trendy woman started' is the wordplay.
'trendy' becomes 'hip' (I've seen this before).
'woman' becomes 'rose' ().
'started' means one lot of letters go next to another.
'hip' put after 'rose' is 'ROSEHIP'.
(Other definitions for rosehip that I've seen before include "Hedgerow or garden fruit" , "Fruit of the brier" , "Fruit of the briar" , "Berry for syrup" , "Red fruit" .)