Writer to have a go at verse (6)
I believe the answer is:
poetry
'verse' is the definition.
(synonyms)
'writer to have a go' is the wordplay.
'writer' becomes 'poe' (Edgar Allan Poe).
'to have' says to put letters next to each other.
'a go' becomes 'try' (both can mean an attempt).
'poe'+'try'='POETRY'
'at' is the link.
(Other definitions for poetry that I've seen before include "'The Raven'?" , "Sonnets, limericks etc" , "The product of Tennyson or Longfellow" , "Verses" , "Literary art" .)