Area between outfielders (3)
I believe the answer is:
gap
'area between outfielders' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gap that I've seen before include "Open space between two things, mind it" , "Hiatus" , "A breach or pass" , "Breach or lacuna" , "Empty space between things" .)