Crossword Genius

Public relations introduce theme that is plain (7)

Ross

I believe the answer is:

prairie

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'plain' is the definition.
(type of plain)

'public relations introduce theme that is' is the wordplay.
'public relations' becomes 'PR' (abbreviation).
'introduce theme' becomes 'air' (I can't justify this - if you can you should give a lot more credence to this answer).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'pr'+'air'+'ie'='PRAIRIE'

Can you help me to learn more?

(Other definitions for prairie that I've seen before include "Open grassland in the USA" , "Treeless grassy plain, in the old West perhaps" , "Extensive US grassland" , "Tract of (US) grassland" , "Schooners once crossed it" .)

I've seen this clue in The Globe and Mail.
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