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All answers having "Respond" as clue:

4 Character Answers:

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LISP

OAST

SAUL



5 Character Answers:

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ACTON

AORTA

APPAL

AWASH

KNIFE

MEANT

PIETY

PLEAD

REACT

REPLY

RULES

TENSE

TRITE

WASTE



6 Character Answers:

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ANSWER

YACHTS



7 Character Answers:

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GROWNUP

MATADOR

POACHER



9 Character Answers:

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SUBMARINE



10 Character Answers:

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CARPETTILE



11 Character Answers:

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MYXOMATOSIS

PERFUNCTORY