Crossword Genius

English variant changing say: true (7)

Ross

I believe the answer is:

estuary

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'english variant' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'changing say true' is the wordplay.
'changing' indicates anagramming the letters.
'say'+'true'='saytrue'
'saytrue' is an anagram of 'ESTUARY'.

Can you help me to learn more?

(Other definitions for estuary that I've seen before include "Wide part of a river where it nears the sea" , "Weapon" , "Bristol Channel?" , "eg Thames, Humber" , "Here one comes close to the main" .)

I've seen this clue in The Sun.
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