Crossword Genius

Isn't this Soviet spin pervading? Tag it properly (8)

Ross

I believe the answer is:

agitprop

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

'isn't this soviet spin pervading?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'tag it properly' is the wordplay.
'AGITPROP' is hidden within the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for agitprop that I've seen before include "revolutionary method" , "subversive literature" , "Politically loaded material" , "Revolutionary stirring" , "aggressive political publicity" .)

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