The most common and most likely answer to this crossword clue is the 8 letter word GENERALS
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More clues leading to the result GENERALS
Buddy explains!

The straight part
We know that "commanders" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case commanders = generals.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 GENERALS mean?
GENERALS noun- A general fact or proposition; a generality.
- The holder of a senior military title, originally designating the commander of an army and now a specific rank falling under field marshal (in the British army) and below general of the army or general of the air force in the US army and air forces.
- A great strategist or tactician.
- The head of certain religious orders, especially Dominicans or Jesuits.
- A commander of naval forces; an admiral.
- A general servant; a maid with no specific duties.
- A general anesthetic.
- General anesthesia.
- The general insurance industry.
- To lead (soldiers) as a general.