What does 'quite a prune' mean?

[Pruny]

English Language Tests, Intermediate level

ESL/EFL Test #574 "English Slang Idioms (316)", question 1

"Make sure you practice your free-throws tonight like the coach told you to do. You have the big game coming up and practice makes .........," Dan's father told him.

(a) acceptance
(b) better
(c) passing
(d) perfect

English Language Tests, Intermediate level

ESL/EFL Test #574 "English Slang Idioms (316)", answer 1

"Make sure you practice your free-throws tonight like the coach told you to do. You have the big game coming up and practice makes perfect," Dan's father told him.

Correct answer: (d) perfect
_________________________

What does the phrase "quite a prune ? aren't we" means

[Mister Micawber]

.
Please supply context. To me it sounds as if the listener had been in the swimming pool too long.
.
_________________
Native English teacher at Mister Micawber's

[Kitosdad]

LOL Mr. Micawber.

Perhaps it's, " Quite a prude ", meaning easily offended or disgusted by ribald behaviour.
_________________
Keep it simple. Keep it interesting.