The __, area of Trafalgar Square used for public art (6)

I believe the answer is:

fourth

(Other definitions for fourth that I've seen before include "Between third and fifth" , "Just missing bronze medal?" , "C-F musical interval -- Prince Regent George's eventual regnal number" , "The Press is referred to as this estate" , "Ordinal number for the press - the . . . . . . estate" .)

I've seen this clue in The Guardian.

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