Crossword Genius

Spend a lot on powder? (4)

Ross

I believe the answer is:

blue

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'lot on powder?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for blue that I've seen before include "navy perhaps" , "Sad, melancholy" , "Red-headed Australian" , "Terrible commotion?" , "down in the dumps" .)

I've seen this clue in the Evening Standard.
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