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All answers having "Defeat" as clue:

3 Character Answers:

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SET

TOP



4 Character Answers:

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BEAT

BEST

DRUB

EDGE

LICK

LOSS

MATE

ROUT

RUIN

SINK

STOP

TRIM

WHIP

WHUP

WLOO



5 Character Answers:

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OUTDO

SBACK

UPEND

UPSET

WHOMP

WORST



6 Character Answers:

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ACEOUT

OUTEAT

OUTFOX

OUTGUN

THWART

TRENCH

UNSEAT



7 Character Answers:

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BEATING

CONQUER

OVERRUN

SETBACK

TROUNCE



8 Character Answers:

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CONQUEST

OUTSMART

OVERCOME

WATERLOO



9 Character Answers:

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CHECKMATE



14 Character Answers:

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GETTHEBETTEROF

PUTTHEKIBOSHON



15 Character Answers:

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MOPTHEFLOORWITH