Maid ran between (4)
I believe the answer is:
amid
'between' is the definition.
(I've seen this before)
'maid ran' is the wordplay.
'ran' is an anagram indicator (letters have run around).
'maid' anagrammed gives 'AMID'.
(Other definitions for amid that I've seen before include "In the thick of" , "Within" , "Maid (anag)" , "In the middle of" , "'See . . . . the winter's snow' (carol)" .)