Good time to indicate writer (9)
I believe the answer is:
ballpoint
'writer' is the definition.
(writing implement)
'good time to indicate' is the wordplay.
'good time' becomes 'ball' (I've seen this in another clue).
'to indicate' becomes 'point' ('point' can be a synonym of 'indicate').
'ball'+'point'='BALLPOINT'
(Other definitions for ballpoint that I've seen before include "Type of pen" , "Writer" , "Biro" .)