Citi Field team, on scoreboards (3)
I believe the answer is:
nym
'citi field team on scoreboards' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nym that I've seen before include "Criminal crony of Falstaff" , "A servant of Falstaff" , "Falstaff crony (Hen.V)" , "One of Falstaff's followers (TMWOW)" , "Corporal in Henry V" .)