She's a bit of a harridan (3)
I believe the answer is:
ida
'she's' is the definition.
(I've seen this before)
'a bit of a harridan' is the wordplay.
'a bit of' indicates a hidden word.
'IDA' is hidden within 'harridan'.
(Other definitions for ida that I've seen before include "'Princess - - ' (G & S)" , "musical princess" , "Classical mountain" , "Cretan mount" , "Greek mount - Gilbertian princess" .)