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All answers having "Extend" as clue:

3 Character Answers:

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LIE



4 Character Answers:

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MESS

REUP

ROAM

SPAN



5 Character Answers:

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ADDON

DATED

OFFER

REACH

RENEW

SETTO

SPLAY

WIDEN



6 Character Answers:

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OUTLIE

SMARMY

SPREAD



7 Character Answers:

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ADDONTO

BROADEN

DRAWOUT

LEARNER

PROLONG

RADIATE

REELOUT

STRETCH



8 Character Answers:

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CONTINUE

ELONGATE

ESOTERIC

LENGTHEN

PROTRACT

REACHOUT



9 Character Answers:

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PROPAGATE



10 Character Answers:

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DAWNCHORUS

OUTSTRETCH

PROLONGATE



11 Character Answers:

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IMPROVIDENT