Crossword Genius

Social worker one political opponent (4)

Ross

I believe the answer is:

anti

I'm a little stuck... Click here to teach me more about this clue!

'political opponent' is the definition.
'anti' can be an answer for 'opponent' (someone opposed to something). I am not certain of the 'political' bit.

'social worker one' is the wordplay.
'social worker' becomes 'ant' (ants are social insects).
'one' becomes 'i' (Roman numeral).
'ant'+'i'='ANTI'

Can you help me to learn more?

(Other definitions for anti that I've seen before include "Prefix meaniing against" , "Against, informally" , "Prefix meaning against" , "An opponent - opposed to party policy, etc" , "one opposing?" .)

I've seen this clue in The Sun.
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