
1) Circus of note 2) Shopping street in London 3) Supermarket of Bulgaria 4) Work by Arnold Bennett
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https://www.crosswordclues.com/clue/piccadilly

Piccadilly is one of the widest and straightest streets in central London. It is the location of several notable London landmarks and buildings, including Fortnum & Mason, the Royal Academy, the Ritz Hotel, the RAF Club, Hatchards, the Embassy of Japan and the High Commission of Malta. Simpson`s, once amongst the United Kingdom`s leading clothin.....
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http://en.wikipedia.org/wiki/Piccadilly
[supermarket chain] Piccadilly (Пикадили) is a Bulgarian supermarket chain based in Varna. Founded as a 51% foreign-owned company in 1994, it opened its first supermarket in Varna in 1994 and became 100% Bulgarian-owned in 2003. Piccadilly is known for its near-complete dominance of the market in Varna to the extent that it prevents...
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http://en.wikipedia.org/wiki/Piccadilly_(supermarket_chain)

• (n.) A high, stiff collar for the neck; also, a hem or band about the skirt of a garment, -- worn by men in the 17th century.
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http://thinkexist.com/dictionary/meaning/piccadilly/

Piccadilly is a type of lace so called on account of its little spear-points, and much in fashion during the reign of Elizabeth I. Later, in the reign of James I the high ruff was called a piccadilly.
Found on
http://www.probertencyclopaedia.com/browse/PP.HTM

Piccadilly is London Cockney rhyming slang for chilly.
Found on
http://www.probertencyclopaedia.com/browse/ZP.HTM
No exact match found.