The most common and most likely answer to this crossword clue is the 7 letter word LUMPIER
L
U
M
P
I
E
R
More clues leading to the result LUMPIER
Buddy explains!

The straight part
We know that "less even" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case less even = lumpier.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 LUMPIER mean?
LUMPIER adjective- Full of lumps, not smooth.
- Of a water surface: covered in many small waves as a result of wind; choppy.