Cursor controllers (4)
I believe the answer is:
mice
'cursor controllers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mice that I've seen before include "Surfers click with these" , "''Of ... and Men'' (John Steinbeck)" , "They'll play when the cat's away" , "Domestic rodents" , "Small creatures in vermicelli" .)