meaning of pikestaff

[A. Homer]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #20 "English Idioms and Phrases", question 5

So, is everything plain as a pikestaff? Oh, yes indeed sir!

(a) clean
(b) clear
(c) messy
(d) in position

English Idioms and Expressions, Intermediate level

ESL/EFL Test #20 "English Idioms and Phrases", answer 5

So, is everything clear? Oh, yes indeed sir!

Correct answer: (b) clear
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What does pikestaff mean?

A. Homer

[Mister Micawber]

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PIKESTAFF.
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Native English teacher at Mister Micawber's