Writer handled piece of advice (4,3)
I believe the answer is:
felt tip
'writer' is the definition.
(a felt tip pen is something which writes)
'handled piece of advice' is the wordplay.
'handled' becomes 'felt' (feel can mean to handle).
'piece of advice' becomes 'tip' (a tip is a piece of advice).
'felt'+'tip'='FELT-TIP'
(Other definitions for felt tip that I've seen before include "writer" , "(Pen with) fibre point" , "Type of pen" , "Variety of pen" .)