Yacht I’m manoeuvring left: not true! (8)

I believe the answer is:

mythical

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'yacht i'm manoeuvring left not true' is the definition.
I can't tell whether this definition defines the answer.

'yacht i'm manoeuvring left' is the wordplay.
'manoeuvring' indicates anagramming the letters.
'left' becomes 'l' (common abbreviation).
'yacht'+'im'='yachtim'
'yachtim' anagrammed gives 'mythica'.
'mythica'+'l'='MYTHICAL'

Can you help me to learn more?

(Other definitions for mythical that I've seen before include "Legendary" , "Imaginary or based on folk tales" , "Fabulous; fictitious" , "Based on fable" , "Based on traditional stories" .)

I've seen this clue in The Sun.

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