Volume with Irish poetry (5)
I believe the answer is:
verse
'poetry' is the definition.
('verse' can be a synonym of 'poetry')
'volume with irish' is the wordplay.
'volume' becomes 'v'.
'with' means one lot of letters go next to another.
'irish' becomes 'erse' (I've seen this before).
'v'+'erse'='VERSE'
(Other definitions for verse that I've seen before include "Stanza; poetry" , "Poems" , "Piece of poetry" , "Metrical text" , "few lines of writing?" .)