Parramatta guests show some fever (4)
I believe the answer is:
ague
'fever' is the definition.
(I've seen this in another clue)
'parramatta guests show some' is the wordplay.
'some' indicates a hidden word.
'AGUE' is hidden within 'parramatta guests show'.
(Other definitions for ague that I've seen before include "Sweating, shivering, fit (once)" , "Complaint" , "Old word for fever" , "Malaria, for example" , "Feverish illness" .)