Sensed, advice for writer (4,3)
I believe the answer is:
felt tip
'writer' is the definition.
(a felt tip pen is something which writes)
'sensed advice' is the wordplay.
'sensed' becomes 'felt' (synonyms).
'advice' becomes 'tip' (a tip is a piece of advice).
'felt'+'tip'='FELT-TIP'
'for' acts as a link.
(Other definitions for felt tip that I've seen before include "writer" , "(Pen with) fibre point" , "Type of pen" , "Variety of pen" .)