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All answers having "Protective covering" as clue:

3 Character Answers:

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BIB

MAT



4 Character Answers:

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COAT

ERSE

TARP



5 Character Answers:

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ARMOR

LINER



6 Character Answers:

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ARMOUR

COCOON

SHEATH

SHIELD



8 Character Answers:

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ARMATURE

SUNBLOCK