The most common and most likely answer to this crossword clue is the 6 letter word SHORTS
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More clues leading to the result SHORTS
Buddy explains!

The straight part
We know that "double defn." is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case double defn. = shorts.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 SHORTS mean?
SHORTS noun- A short circuit.
- A short film.
- A short version of a garment in a particular size.
- A shortstop.
- A short seller.
- A short sale.
- A summary account.
- A short sound, syllable, or vowel.
- An integer variable having a smaller range than normal integers; usually two bytes long.
- An automobile; especially in crack shorts, to break into automobiles.
- To cause a short circuit in (something).
- Of an electrical circuit, to short circuit.
- To shortchange.
- To provide with a smaller than agreed or labeled amount.
- To sell something, especially securities, that one does not own at the moment for delivery at a later date in hopes of profiting from a decline in the price; to sell short.
- To shorten.
- Trousers worn primarily in warm weather that do not go lower than the knees.
- Underwear bottoms.
- Remnants, clippings, trimmings of production processes.
- The part of milled grain sifted out which is next finer than the bran; pollard.
- Short, inferior hemp.