Cryptic crossword clue
Rudest officer commanding ruler, a brainy type 12

The most common and most likely answer to this crossword clue is the 12 letter word BLUESTOCKING

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "a brainy type" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a brainy type = bluestocking.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does BLUESTOCKING mean?

BLUESTOCKING noun
  1. A scholarly, literary, or cultured woman.
  2. A member of the 18th-century Blue Stockings Society

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