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
_________________________

What does pikestaff mean?

A. Homer

[Mister Micawber]

.
PIKESTAFF.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber