I guess, the answer to the emoji riddle is likely MONACO.

Monkey sounds like "mon", which can be phonetically associated with "Monaco".

Tennis racket could represent a "court", another word associated with Monaco (Monte Carlo Court).

Ball is a less specific clue, but it could further reinforce the idea of a court (tennis balls) or a principality (playing ball, meaning following the rules).

While the "CROP" might represent the "CO"