Too much sentimentality arising from Electra complex (7)

I believe the answer is:

treacle

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'too much sentimentality' is the definition.
'treacle' can be an answer for 'sentimentality' (I've seen this before). I am unsure of the 'too much' bit.

'electra complex' is the wordplay.
'complex' indicates anagramming the letters.
'electra' with letters rearranged gives 'TREACLE'.

'arising from' acts as a link.

Can you help me to learn more?

(Other definitions for treacle that I've seen before include "Contrived sentimentality - sticky substance" , "Syrup, molasses" , "refined product" , "flattery" , "Electra (anag)" .)

I've seen this clue in The Times.

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