Crossword Genius

Stupid officer, idiot primarily into money (7)

Ross

I believe the answer is:

doltish

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'stupid' is the definition.
('doltish' can be similar in meaning to 'stupid')

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

Can you help me to learn more?

(Another definition for doltish that I've seen is " Dull, stupid".)

I've seen this clue in The Times.
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