Clue: Plain, quiet, less stuffy royal brought to the fore (7)
Answer: PRAIRIE
Explanation: Definition: Plain
 P(abbrev. for "piano", the musical direction to play softly/quietly) + [ AIRIER(less stuffy/with more air circulating) **with** "R"(abbrev. for "Royal") **moved from last to first position in the word**(brought to the fore) ].