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