Crossword Genius

Earth perhaps flat - theory, originally (6)


I believe the answer is:


'earth perhaps' is the definition.
(earth is a kind of planet)

'flat theory originally' is the wordplay.
'flat' becomes 'plane' (I've seen this before).
'originally' indicates taking the first letters.
The initial letter of 'theory' is 't'.

(Other definitions for planet that I've seen before include "World" , "Is Pluto one?" , "Orbiting body in the heavens" , "Jupiter is one" , "One orbiting star" .)

I've seen this clue in The Telegraph.
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