Greek god on the Spanish jury (5)
I believe the answer is:
panel
'jury' is the definition.
(I know that jury can be written as panel)
'greek god on the spanish' is the wordplay.
'greek god' becomes 'Pan' (Pan is an example).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the spanish' becomes 'el' ('the' in Spanish).
'pan'+'el'='PANEL'
(Other definitions for panel that I've seen before include "Committee appointed to judge a competition" , "Team of judges" , "Interviewing group" , "Rect. section; jury" , "Section of vehicle bodywork" .)