Crossword Genius

Couple in the back of huge car could be stars (6)

Ross

I believe the answer is:

gemini

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'be stars' is the definition.
(constellation)

'couple in the back of huge car' is the wordplay.
'couple in' becomes 'g' (I can't explain this - if you can you should give a lot more credence to this answer).
'the back of' indicates one should take the final letters.
'car' becomes 'mini' (Mini Cooper).
The last letter of 'huge' is 'e'.
'g'+'e'+'mini'='GEMINI'

'could' is the link.

Can you help me to learn more?

(Other definitions for gemini that I've seen before include "star group" , "set of twinklers" , "Third zodiacal sign" , "lot of stars" , "Zodiac sign - the Twins" .)

I've seen this clue in The Independent.
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