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Apologies, my #20 is a bit similar to geeker @6, but I hope the use of ‘station’ is sufficiently different.

Team leader organised protest about nothing changing (10)

[team leader = T; organised = RAN; protest about nothing = SIT-I(O)N]

Angry Democrat leaves floundering anti-modernist movement (10)

Development deal loses account - I step in (10)

TRANS(AC)TION --> TRANS(I)TION

https://en.wikipedia.org/wiki/Artist_development_deal

Undue radicalisation of Trade Unionist movement (10)

Math prof’s change corrected sin to tan , I start to realise (10)

[anagram: SIN TO TAN I R]

Change oxidised state in iron ? (10)

Seem to recall chemical definition of oxidation as "loss of electron(s)"

(STATEINIRON - E)*

Iron is a transition metal so "?" for the semi &lit and dbe.

Flux for metals like copper and zinc (10)

Tremendous clues so far. You all are making my job difficult, but keep up the good work.

Rosinante's gait, perhaps unwise path. (10)

Subtractive anag. ROSINANTES GAIT - SAGE