Whelp with European dice (4)
I believe the answer is:
cube
'dice' is the definition.
('cube' can be a synonym of 'dice')
'whelp with european' is the wordplay.
'whelp' becomes 'cub' (I've seen this before).
'with' means one lot of letters go next to another.
'european' becomes 'e' (abbreviation e.g. EU).
'cub'+'e'='CUBE'
(Other definitions for cube that I've seen before include "Six-sided solid" , "Six-faced solid" , "Product of three equal numbers" , "Square-faced solid" , "Cut into solid squares" .)