Crossword Genius

One in party with foremost of Soviet Trotskyites? (9)

Ross

I believe the answer is:

socialist

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'one in party with foremost of soviet trotskyites?' is the definition.
I can't tell whether this definition defines the answer.

'one in party with foremost of soviet trotskyites?' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' means one lot of letters goes inside another.
'party' becomes 'social' (social is a kind of party).
'with' says to put letters next to each other.
'foremost of' says to take the initial letters.
The initial letters of 'soviet trotskyites' is 'st'.
'social'+'st'='socialst'
'i' put inside 'socialst' is 'SOCIALIST'.

Can you help me to learn more?

(Other definitions for socialist that I've seen before include "See 1" , "Left-winger" , "Political theorist" , "Fabian" , "Lefty" .)

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