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All answers having "Frequently" as clue:

3 Character Answers:

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OFT

OTT

SIR



4 Character Answers:

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ALOT

APSE

HEIR

LOVE

MUCH

ONCE

YULE



5 Character Answers:

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ACORN

OFTEN

SETTO

SPLIT

TAILS



6 Character Answers:

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CHOICE

EDITOR

NUTMEG

PERMIT

THRUST



7 Character Answers:

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GRIMSBY

MONOCLE

PAIRING

PAYROLL



8 Character Answers:

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EVENTFUL

INTREPID

OFTTIMES

TREASURE

UNSELDOM



9 Character Answers:

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MANYATIME

MANYTIMES



10 Character Answers:

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OFTENTIMES



11 Character Answers:

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BAKERSDOZEN



12 Character Answers:

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RADIOGRAPHER



13 Character Answers:

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LACKADAISICAL



15 Character Answers:

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ONAREGULARBASIS