Cryptic crossword clue
Odd characters in britches pose showing muscle 6

The most common and most likely answer to this crossword clue is the 6 letter word BICEPS

I've seen this crossword clue in The Daily Telegraph
B
I
C
E
P
S


Buddy explains!

The straight part
We know that "muscle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case muscle = biceps.
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 BICEPS mean?

BICEPS noun
  1. Any muscle having two heads.
  2. Specifically, the biceps brachii, the flexor of the elbow.
  3. The upper arm, especially the collective muscles of the upper arm.
  4. A point in a metrical pattern that can be filled either with one long syllable (a longum) or two short syllables (two brevia)

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