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All answers having "F" as clue:

3 Character Answers:

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KEY

RHO



4 Character Answers:

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BOMB

STOP



5 Character Answers:

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FALSE

FORTE

FRANC

TROOP



6 Character Answers:

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ESHARP



10 Character Answers:

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FALSESTART



11 Character Answers:

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FASTSTARTER

STOOLPIGEON

TREPIDATION



14 Character Answers:

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POLICEINFORMER



17 Character Answers:

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ROCKEFELLERCENTER