She's a little intimidating (3)
I believe the answer is:
ida
'she's' is the definition.
(I've seen this before)
'a little intimidating' is the wordplay.
'a little' indicates the answer is hidden within the clue (a little bit of the clue).
'IDA' is hidden in the letters of 'intimidating'.
(Other definitions for ida that I've seen before include "Greek mount - Gilbertian princess" , "musical princess" , "Stagey princess" , "Trojan Mount; G&S Princess" , "noted princess" .)