The most common and most likely answer to this crossword clue is the 7 letter word RAMRODS
R
A
M
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The straight part
We know that "Martinets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case martinets = ramrods.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 RAMRODS mean?
RAMRODS noun- Device used with muzzleloaders to push the projectile up against the propellant.
- Ranch or trail foreman, usually the first or second person in charge. The person responsible for getting the work done.
- An erect penis.
- To force.