It's said to dismiss Poland's No 1 playmaker (5)
I believe the answer is:
pshaw
'it's said to dismiss' is the definition.
(dismissive expression)
'poland's no 1 playmaker' is the wordplay.
'poland's no 1' becomes 'p' (1st letter of 'poland').
'playmaker' becomes 'Shaw' (playwright George Bernard Shaw).
'p'+'shaw'='PSHAW'
(Other definitions for pshaw that I've seen before include "scornful reaction" , "Exclamation of impatience" , "it's disgusting" , "Expression of impatience" , "Contemptuous expression" .)