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All answers having "Persevere" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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LAST

PLOD

TEND



6 Character Answers:

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ENDURE

HANGIN

HANGON

HOLDON

INSIST

KEEPAT

KEEPON



7 Character Answers:

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CARRYON

PERSIST

PRESSON

STICKAT



8 Character Answers:

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KEEPATIT



9 Character Answers:

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SOLDIERON

STANDFAST



10 Character Answers:

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GRINDITOUT

STAYWITHIT

STICKITOUT

TOUGHITOUT



11 Character Answers:

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DONTSTOPNOW

HANGINTHERE

NEVERSAYDIE

STICKWITHIT

TRYTRYAGAIN



13 Character Answers:

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KEEPONTRUCKIN

STAYTHECOURSE



14 Character Answers:

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HOLDONESGROUND

KEEPONESCHINUP



15 Character Answers:

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PUTUPAGOODFIGHT

STANDYOURGROUND

STICKTOONESGUNS

WEATHERTHESTORM