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' is a reversal indicator.
'with' means one lot of letters go next to another.
'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 off 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" .)