Crossword Genius

Spoke but spoke indistinctly first off (7)

Ross

I believe the answer is:

uttered

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'spoke' is the definition.
('utter' can be a synonym of 'speak')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for uttered that I've seen before include "Pronounced" , "Said (something)" , "Spoken" , "In law, put forged money into circulation" , "Spoke and put into circulation" .)

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