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All answers having "Held back" as clue:

4 Character Answers:

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KEPT



5 Character Answers:

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ATBAY



6 Character Answers:

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CURBED

KEPTIN

STAYED

WAITED



7 Character Answers:

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STIFLED



8 Character Answers:

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DETAINED

REINEDIN

RETARDED



9 Character Answers:

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INRESERVE

KEPTATBAY

REFRAINED

REPRESSED



10 Character Answers:

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RESTRAINED