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All answers having "Pen" as clue:

3 Character Answers:

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CAN

EPI

GEL

PAL

RHO

SHE

STY



4 Character Answers:

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AJAR

BIRO

CAGE

COOP

FOLD

JAIL

PALS

POKY

STIR

SWAN

VAPE



5 Character Answers:

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HEMIN

HUTCH

STYLO

WRITE



6 Character Answers:

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AUTHOR

COOLER

CORRAL

ENCAGE

PRISON



7 Character Answers:

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CONFINE

ENCLOSE

SLAMMER



8 Character Answers:

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BIGHOUSE

HOOSEGOW



9 Character Answers:

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BALLPOINT

ENCLOSURE

INCLOSURE

WRITEDOWN



10 Character Answers:

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GHOSTWRITE



15 Character Answers:

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FENCEDENCLOSURE

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