Crossword Genius

Dotty lady who sings (4)

Ross

I believe the answer is:

gaga

This clue is a double definition.

'dotty' is the first definition.
('gaga' can be a synonym of 'dotty')

'lady who sings' is the second definition.
(I've seen this before)

(Other definitions for gaga that I've seen before include "Slang for crazy - apply a gag" , "Slangily and repetitively crazy" , "Barmy joke, third in cracker" , "person who is senile?" , "In repetitive slang, senile or crazy" .)

I've seen this clue in The Telegraph.
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