Serves up a lime topping/filling in rice cake (6)

I believe the answer is:

eclair

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'cake' is the definition.
(eclair is a type of cake)

I can't explain the remainder of the clue.

(Other definitions for eclair that I've seen before include "Lacier type of confection" , "Long chocolate cake for Claire" , "Soft cream cake" , "Sweet thing" , "comedian Jenny?" .)

I've seen this clue in The Irish Times.

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