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All answers having "Repeat" as clue:

3 Character Answers:

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RHO

RNS

SAY



4 Character Answers:

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ECHO

LORE

PROT

REDO



5 Character Answers:

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AGAIN

EAVES

ITERO

RECUR

RERUN

THERE



6 Character Answers:

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PARROT

REHASH

RELATE

RETELL



7 Character Answers:

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DOAGAIN

ITERATE

REPRISE

REPROOF

SAYOVER



9 Character Answers:

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REITERATE



15 Character Answers:

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RUNTHATXMEAGAIN