Intolerable sentimentality from European after claret's drunk (7)

I believe the answer is:

treacle

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'intolerable sentimentality' is the definition.
'treacle' can be an answer for 'sentimentality' (treacle can mean sentimental speech). I'm unsure of the 'intolerable' bit.

'european after claret's drunk' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'after' says to put letters next to each other.
'drunk' indicates an anagram.
'claret' is an anagram of 'treacl'.
'e' put after 'treacl' is 'TREACLE'.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for treacle that I've seen before include "Saplike stuff" , "Contrived sentimentality - sticky substance" , "Electra (anag)" , "Sweet sticky syrup" , "cloying stuff" .)

I've seen this clue in The Telegraph.

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