The most common and most likely answer to this crossword clue is the 5 letter word LOGOS
L
O
G
O
S
More clues leading to the result LOGOS
Buddy explains!

The straight part
We know that "Designs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case designs = logos.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 LOGOS mean?
LOGOS noun- A form of rhetoric in which the writer or speaker uses logic as the main argument.
- Alternative letter-case form of Logos
- A visual symbol or emblem that acts as a trademark or a means of identification of a company or organization.
- (by extension) An audio recording for the same purpose; a jingle.
- A single graphic which contains one or more separate elements.
- An ensign, a badge of office, rank, or power.