"X” — author on strike (5)
I believe the answer is:
chime
'strike' is the definition.
(thesaurus)
'x author on' is the wordplay.
'x' becomes 'chi' (I've seen this before).
'author' becomes 'me' (the author of the crossword).
'on' says to put letters next to each other.
'chi'+'me'='CHIME'
(Other definitions for chime that I've seen before include "Melodious bell sound" , "Ring; harmonise" , "Clang" , "Harmonise, peal" , "(Bell) sound the hour" .)