This when scone arrived he whipped up, jam finally added? (10,5)

I believe the answer is:

devonshire cream

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'scone arrived he whipped up jam finally added?' is the wordplay.
'whipped up' is an anagram indicator.
'finally' says to take the final letters.
'added?' says to put letters next to each other.
The final letter of 'jam' is 'm'.
'scone'+'arrived'+'he'='sconearrivedhe'
'sconearrivedhe' is an anagram of 'devonshirecrea'.
'devonshirecrea'+'m'='DEVONSHIRE CREAM'

'when' acts as a link.

Can you help me to learn more?

(Another definition for devonshire cream that I've seen is " delicacy".)

I've seen this clue in The Telegraph.

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