Crossword Genius

Adult leaving El Dorado loaded showed great pleasure (7)

Ross

I believe the answer is:

drooled

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'showed great pleasure' is the definition.
Although both the answer and definition are past participle verbs, I don't understand how one could define the other.

'adult leaving el dorado loaded' is the wordplay.
'adult' becomes 'a' (abbreviation).
'leaving' indicates named letters should be taken away.
'el dorado' becomes 'eldorado' (synonyms).
'loaded' is an anagram indicator (loaded can mean drunk).
'eldorado' with 'a' taken out is 'eldordo'.
'eldordo' anagrammed gives 'DROOLED'.

Can you help me to learn more?

(Another definition for drooled that I've seen is " Slavered".)

I've seen this clue in The Telegraph.
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