This puzzle's perimeter entries are all types of them

Question:

Answer:

GUARDS

Length:

Similar Crossword Questions:

Make of six models that are subject to recall ... and being sent back inside this puzzle's theme entries
Charged particle taken from this puzzle's four longest entries
Need bailing, or what five entries in this puzzle can do to make two overlapping words or phrases
Like the four theme entries in this puzzle, as it were
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There's one at the beginning of each of this puzzle's four theme entries
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What this puzzle's columnar entries are taken from
Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)