Crossword Genius

A relic could be this sweet pastry (6)

Ross

I believe the answer is:

eclair

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

'sweet pastry' is the definition.
'eclair' can be an answer for 'pastry' (eclair is a kind of pastry). I'm not certain of the 'sweet' bit.

'a relic could be' is the wordplay.
'could be' indicates anagramming the letters.
'a'+'relic'='arelic'
'arelic' anagrammed gives 'ECLAIR'.

'this' acts as a link.

Can you help me to learn more?

(Other definitions for eclair that I've seen before include "Choux pastry cream cake" , "Long thin cake with chocolate and cream" , "Cream bun" , "A long thin cake with chocolate covering" , "Type of cream cake" .)

I've seen this clue in the Sydney Morning Herald.
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