Criticise the Spanish group making decision? (5)
I believe the answer is:
panel
'group making decision?' is the definition.
(eg a judging panel)
'criticise the spanish' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'the spanish' becomes 'el'.
'pan'+'el'='PANEL'
(Other definitions for panel that I've seen before include "Committee appointed to judge a competition" , "Bordered rectangular area" , "Committee to judge a competition or list from which to appoint someone" , "Section of wood or metal" , "Game show team" .)