Crossword Genius

Conservative spouted air in speech (4)

Ross

I believe the answer is:

blue

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'conservative' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for blue that I've seen before include "This could be royal or navy" , "See 7 Across" , "Indecent" , "navy perhaps" , "Spend all at once - colour" .)

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