The most common and most likely answer to this crossword clue is the 7 letter word DRESSED
I've seen this crossword clue in The Guardian
D
R
E
S
S
E
D
More clues leading to the result DRESSED
- Directed to drop advert put on clothing
- Lined up and put on clothes
- Like crab served up with mayonnaise, say
- Mostly sweet daughter twirling in clothes
- Spoken to without notice to be prepared
- Gets into line, prepared for a roasting
- Doctor sees wounded duke bandaged
- Blue releasing record in fancy packaging
- Got up without notice to speak directly to journalist
- Day after day seer’s unusually attired
Buddy explains!

The straight part
We know that "prepared" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case prepared = dressed.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 DRESSED mean?
DRESSED verb- To fit out with the necessary clothing; to clothe, put clothes on (something or someone).
- To clothe oneself; to put on clothes.
- To put on the uniform and equipment necessary to play the game.
- Of a man, to allow the genitals to fall to one side or other within the trousers.
- To prepare (food) for cooking, especially by seasoning it.
- To prepare oneself; to make ready.
- To adorn, ornament.
- To ornament (a ship) by hoisting the national colours at the peak and mastheads, and setting the jack forward; when "dressed full", the signal flags and pennants are added.
- To prepare (a set) by installing the props, scenery, etc.
- To treat (a wound, or wounded person).
- To prepare for use; to fit for any use; to render suitable for an intended purpose; to get ready.
- To prepare the surface of (a material; usually stone or lumber).
- To manure (land).
- To bolt or sift flour.
- (sometimes imperative) To arrange in exact continuity of line, as soldiers; commonly to adjust to a straight line and at proper distance; to align.
- To break and train for use, as a horse or other animal.
- Having been subjected to a preparatory process or treatment; treated, prepared.
- Prepared for eating, especially by the addition of specific condiments or dressing.
- Wearing clothes; attired (now often with qualifying word).