Thrilled, left the stage carrying foremost of cups (7)
I believe the answer is:
excited
'thrilled' is the definition.
(similar in meaning)
'left the stage carrying foremost of cups' is the wordplay.
'left the stage' becomes 'exited' (I've seen this before).
'carrying' indicates putting letters inside.
'foremost of' suggests taking the first letters.
The first letter of 'cups' is 'c'.
'exited' enclosing 'c' is 'EXCITED'.
(Other definitions for excited that I've seen before include "Jubilant" , "in a state of agitation" , "in high spirits" , "Very eager and enthusiastic" , "With feelings roused, emotionally high" .)