The most common and most likely answer to this crossword clue is the 4 letter word CAMO
C
A
M
O
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The cryptic/wordplay part
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What does CAMO mean?
CAMO noun- A pattern on clothing consisting of irregularly shaped patches that are either greenish/brownish, brownish/whitish, or bluish/whitish, as used by ground combat forces.
- Clothes made from camouflage fabric, for concealment in combat or hunting.
- To camouflage.
- To put on camouflage clothing.