Tasty treat found in city retreat? (6)

I believe the answer is:

eclair

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'tasty treat' is the definition.
'eclair' can be an answer for 'treat' (type of cake). I'm unsure of the 'tasty' bit.

'city retreat?' is the wordplay.
'city' becomes 'EC' (postcode for the City of London).
'retreat?' becomes 'lair' (both can mean a private hideout).
'ec'+'lair'='ECLAIR'

'found in' is the link.

Can you help me to learn more?

(Other definitions for eclair that I've seen before include "Lacier type of confection" , "Long (but not long-lasting) cake" , "A long choux cake" , "Finger-shaped cake with cream and chocolate" , "Sweet thing" .)

I've seen this clue in The Independent.

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