Cryptic crossword clue
Overruns popular party with socialists primarily 7

The most common and most likely answer to this crossword clue is the 7 letter word INFESTS

I've seen this crossword clue in Financial Times
I
N
F
E
S
T
S

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does INFESTS mean?

INFESTS verb
  1. To inhabit a place in unpleasantly large numbers; to plague, harass.
  2. (of a parasite) To invade a host plant or animal.

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