Sends over editorial centrefold on pastry (6)

I believe the answer is:

eclair

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

'pastry' is the definition.
(eclair is a kind of pastry)

'sends over editorial centrefold' is the wordplay.
'ECLAIR' is hidden back-to-front in amongst the letters.
However, I'm uncertain how this is indicated.

'on' is the link.

Can you help me to learn more?

(Other definitions for eclair that I've seen before include "Bakery item" , "Dainty" , "Cream bun" , "I clear off with thin chocolate cake" , "Oblong cream puff" .)

I've seen this clue in The Irish Times.

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