Stir the writer to pen ordinary verse (4)
I believe the answer is:
move
'stir' is the definition.
(thesaurus)
'the writer to pen ordinary verse' is the wordplay.
'the writer' becomes 'me' (the person who is writing these clues).
'to pen' means one lot of letters goes inside another.
'ordinary' becomes 'o' (abbreviation e.g. O-Levels).
'verse' becomes 'v'.
'o'+'v'='ov'
'me' going around 'ov' is 'MOVE'.
(Other definitions for move that I've seen before include "change position on board" , "Change residence; propose formally" , "Shift" , "Go; change opinion" , "Proceed" .)