Train, please, on two-thirds of RAF jets? (10)
I believe the answer is:
aeroplanes
'jets?' is the definition.
(jet is a kind of aeroplane)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for aeroplanes that I've seen before include "Fliers" , "Aircraft" .)
I've seen this clue in The Telegraph.
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