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All answers having "Highest point" as clue:

3 Character Answers:

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MAX

TOP



4 Character Answers:

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ACME

APEX

NOON

PEAK

TIER



5 Character Answers:

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CREST

LANCE

PINNE

SPUDS



6 Character Answers:

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APOGEE

BREEZE

CLIMAX

MIDDAY

SUMMIT

TIPTOP

VERTEX

ZENITH



7 Character Answers:

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CALLFOR

EVEREST

THEACME



8 Character Answers:

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CAPSTONE

MERIDIAN

PINNACLE

SCUTTLED

TIPPYTOP



9 Character Answers:

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UNDERDONE



11 Character Answers:

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SCREWDRIVER



13 Character Answers:

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WATTLEANDDAUB