Ceremony taken in by writers (4)
I believe the answer is:
rite
'ceremony' is the definition.
(rite is a kind of ceremony)
'taken in by writers' is the wordplay.
'taken in by' says the answer is hidden in the clue.
'RITE' is hidden in the letters of 'writers'.
(Other definitions for rite that I've seen before include "(Words used in) ceremonial" , "Custom" , "Ceremony, liturgy" , "Mystery - ceremony" , "Ceremonial procedure" .)