Crossword Genius

Fabulous leader’s euphoria ending thoroughfare (4)

Ross

I believe the answer is:

fast

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'fabulous' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'leader's euphoria ending thoroughfare' is the wordplay.
'leader' becomes 'f' (I have seen 'German leader ' mean 'f' so perhaps 'leader' could also mean 'f').
'ending' says to take the final letters (the ending of the word).
'thoroughfare' becomes 'st' (I've seen this in other clues).
The final letter of 'euphoria' is 'a'.
'f'+'a'+'st'='FAST'

Can you help me to learn more?

(Other definitions for fast that I've seen before include "Starve; quick" , "Firm < moving rapidly" , "Securely fixed" , "Rapidly; tight" , "Rapid - diet" .)

I've seen this clue in the Sydney Morning Herald.
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