We turned up with endless Irish pitchers (5)
I believe the answer is:
ewers
'pitchers' is the definition.
('ewer' can be a synonym of 'pitcher')
'we turned up with endless irish' is the wordplay.
'turned up' says the letters should be written backwards.
'with' says to put letters next to each other.
'endless' means to remove the last letter.
'irish' becomes 'erse' (old-fashioned term for the Irish language).
'we' in reverse letter order is 'ew'.
'erse' with its last letter taken away is 'ers'.
'ew'+'ers'='EWERS'
(Other definitions for ewers that I've seen before include "Water jugs" , "Vase-shaped jugs" , "Jugs thrown into sewer" , "Large jugs" , "Vessels with handle and spout" .)