Sweet treats served by London hide-outs (7)

I believe the answer is:

eclairs

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'sweet treats' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for eclairs that I've seen before include "Oblong pastries" , "Cream cakes" , "Elongated cream puffs" , "sticky fingers" , "Oblong cream puffs" .)

I've seen this clue in The Independent.

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