One writer on time to become another (4)
I believe the answer is:
poet
'become another' is the definition.
I can't judge whether this definition defines the answer.
'one writer on time' is the wordplay.
'one writer' becomes 'poe' (Edgar Allan Poe).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'time' becomes 't' (abbreviation).
'poe'+'t'='POET'
'to' is the link.
Can you help me to learn more?
(Other definitions for poet that I've seen before include "Bard" , "Burns was one" , "Minstrel" , "Heaney or Yeats, say" , "Pound, say" .)