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All answers having "Man-made material" as clue:

3 Character Answers:

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LAP

MIL



4 Character Answers:

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PANG

SCUT



5 Character Answers:

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DRONE

NYLON

SPIES



6 Character Answers:

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ESCUDO

PRINCE

SALAMI



7 Character Answers:

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COLONEL

SPECTRE



8 Character Answers:

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BULGARIA



11 Character Answers:

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GREASEPAINT

MAINTENANCE



12 Character Answers:

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SHORTCHANGED