Sweet treats served by London hide-outs (7)

I believe the answer is:

eclairs

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

'sweet treats' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being plural nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

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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