The most common and most likely answer to this crossword clue is the 5 letter word CRURA
C
R
U
R
A
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The straight part
We know that "legs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case legs = crura.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 CRURA mean?
CRURA noun- The shin (tibia and fibula)
- A leglike part; shank