Crossword Genius

Posh rival picked up in spaceship? (3)

Ross

I believe the answer is:

ufo

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'spaceship?' is the definition.
(I have seen 'Potential spaceship ' mean 'ufo' so perhaps 'spaceship' could also mean 'ufo')

'posh rival picked up' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'rival' becomes 'of' (I can't justify this - if you can you should believe this answer much more).
'picked up' is a reversal indicator.
'of' in reverse letter order is 'fo'.
'u'+'fo'='UFO'

'in' is the link.

Can you help me to learn more?

(Other definitions for ufo that I've seen before include "Space enigma" , "Potential flying saucer" , "Mysterious craft" , "Something mysterious" , "ET's vehicle?" .)

I've seen this clue in The Sun.
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