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All answers having "Robust" as clue:

3 Character Answers:

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FIT

HLE



4 Character Answers:

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HALE

IRON

RUDE



5 Character Answers:

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BURLY

BUXOM

HARDY

HEFTY

HUSKY

LUSTY

STOUT



6 Character Answers:

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EARTHY

HEARTY

QUAINT

STRONG

STURDY



7 Character Answers:

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AFFRONT

DURABLE

HEALTHY

WELLFED



8 Character Answers:

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STALWART

VIGOROUS



9 Character Answers:

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STRAPPING