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All answers having "Plug-___" as clue:

3 Character Answers:

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INS

NAG

PEG

RHO

TAP

WAD



4 Character Answers:

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CHAW

CHEW

CLOG

FILL

QUID

STOP

TOUT



5 Character Answers:

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BOOST

DAMUP

PROMO

SPARK



6 Character Answers:

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ADVERT

STOPUP

UGLIES



7 Character Answers:

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PROMOTE

STOPPER

STOPPLE