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All answers having "Walking" as clue:

4 Character Answers:

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ENTS

MALL

SAND

TALL



5 Character Answers:

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AFOOT

APIED

ONAIR



6 Character Answers:

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ONFOOT

PACING



7 Character Answers:

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LEINGIT



8 Character Answers:

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AMBULANT

ONALEASH

STEPPING



10 Character Answers:

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AMBULATING

AMBULATION