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All answers having "Regular" as clue:

3 Character Answers:

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GAS



4 Character Answers:

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EVEN

MARE



5 Character Answers:

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HABIT

USUAL



6 Character Answers:

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CLIENT

LEADED

NORMAL

PATRON

RACKET

STATED

STEADY



7 Character Answers:

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HABITUE

ORDERLY

OREGANO

UNIFORM



8 Character Answers:

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PERIODIC



10 Character Answers:

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MEDIUMSIZE



11 Character Answers:

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OSTENTATION