She's in Colindale (5)
I believe the answer is:
linda
'she's' is the definition.
'in colindale' is the wordplay.
'in' says the answer is hidden in the clue.
'LINDA' is hidden within 'colindale'.
(Other definitions for linda that I've seen before include "Girl's name (I, not Y)" , "lady" , "- Ronstadt, US singer" , "23 [LOVELACE]" , "-- Gray, 'Dallas' star" .)