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Administer clip so you act generously (9)

Noticeably fetching the holy to replace me (9)

(My political slant...)

Policy so bad it gets a “u” – and that’s being generous! (9)

BBC

Sloppy coitus rough without STP*? Big-time! (9)

*An automotive oil/fuel additive that used to be heavily advertised in the US.

Switch-hitter leaves lousy biopic, worried no end. (9)

Attempted math geek clue

c₀ + iy₀ formatted extensively. (9)

Calm down - play cool music liberally - profusely (9)

(Play cool music - calm) anagram.
Using “down” to remove “calm”. Not quite, but almost there,
Stretching it a bit perhaps.

Tweak to 16:

c₀ + iy₀ complex? Really! (9)

Heading off, hypocolius flies in flocks (9)

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

Liberally spun US policy takes over (9)