Shout at horse outsiders in Geelong Cup (3,2)
I believe the answer is:
gee up
'geelong cup' is the definition.
I know nothing about this answer so I can't judge whether this works.
'shout at horse outsiders in' is the wordplay.
'shout at' becomes 'gup' (I am not sure about this - if you are sure you should believe this answer much more).
'horse' becomes 'equine' (equine means a horse or related animal).
'outsiders' suggests removing the centre (only the letters on the outside of the word remain).
'in' indicates putting letters inside.
'equine' with its middle taken out is 'ee'.
'gup' going around 'ee' is 'GEE UP'.
Can you help me to learn more?
(Other definitions for gee up that I've seen before include "Hurry along, Dobbin!" , "Encourage (horse)" , "Words of encouragement to a horse" , "Command to horse to go faster" , "Get a move on, Dobbin!" .)