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All answers having "Trace" as clue:

3 Character Answers:

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BIT

TAD



4 Character Answers:

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CLUE

HERE

HINT

IOTA

NOSH

SIGN

WISP



5 Character Answers:

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CATER

GLEAM

REACT

RELIC

SCENT

SHADE

SHRED

SMACK

SPOOR

TINGE



7 Character Answers:

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EDIFICE

ELEMENT

GLIMMER

REMNANT

SOUPCON

STEEPLE

VESTIGE

WHISPER



8 Character Answers:

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SMIDGEON



9 Character Answers:

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PROCREATE

SCINTILLA