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All answers having "Mole" as clue:

3 Character Answers:

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SPY



4 Character Answers:

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PEST

PIER



5 Character Answers:

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AGENT

BORER

NEVUS

PLANT

SAUCE

TAUPE



6 Character Answers:

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TUNLER



7 Character Answers:

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INSIDER



8 Character Answers:

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BURROWER

ENEMYSPY

TUNNELER



10 Character Answers:

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BEAUTYMARK

BREAKWATER

ENEMYAGENT



11 Character Answers:

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DOUBLEAGENT

SKINBLEMISH



15 Character Answers:

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BURROWINGMAMMAL

UNDERCOVERAGENT