Crossword Genius

People united in hope helping to defend popular front, new adventure's beginning (7)

Ross

I think it could be either:

Which length description are you looking for?:

7

7,6
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'new adventure's beginning' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'people united in hope helping to defend popular front' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
'front' could be 'bow' (the bow is the front of a ship) and 'bow' is found within the answer.
The remaining letters 'ra' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for rainbow that I've seen before include "Natural multicoloured arc" , "Iris was its goddess" , "colours in the heavens" , "'I can sing a - - ' (song)" , "Polychromatic arc" .)

I've seen this clue in The Guardian.
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