Plain price? (5)
I believe the answer is:
penny
This might be a double definition.
'plain' is the first definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'price?' is the second definition.
The definition and answer can be both related to property as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for penny that I've seen before include "Bronze coin" , "Coin spent by the desperate?" , "Lancaster" , "coin, decimal with 1a [NEW]" , "Copper coin" .)