Crossword Genius

Erstwhile queen lost crumpled suit in the East End (7)

Ross

I believe the answer is:

whistle

I'm a little stuck... Click here to teach me more about this clue!

'suit in the east end' is the definition.
'whistle' can be an answer for 'suit' (I've seen this before). I'm unsure of the 'in the east end' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for whistle that I've seen before include "sound surprised" , "He wilts (anag.)" , "Pucker up and blow" , "L.S.White (anag.)" , "Shrill piping sound" .)

I've seen this clue in The Independent.
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