Early PC platform (5)
I believe the answer is:
msdos
'early pc platform' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for msdos that I've seen is " Disk-operating system".)
I've seen this clue in the New York Times, the Newsday.com, the L.A. Times Daily, The Washington Post, the LA Times and The Washington Post Sunday.
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