Very Irish poetry (5)
I believe the answer is:
verse
'poetry' is the definition.
(I know that poetry can be written as verse)
'very irish' is the wordplay.
'very' becomes 'v' (common abbreviation).
'irish' becomes 'erse' (old-fashioned term for the Irish language).
'v'+'erse'='VERSE'
(Other definitions for verse that I've seen before include "Metrical text" , "Part of hymn" , "literary offering" , "Piece of poetry" , "few lines of writing?" .)