The most common and most likely answer to this crossword clue is the 6 letter word PATCHY
I've seen this crossword clue in The Guardian
P
A
T
C
H
Y
More clues leading to the result PATCHY
- Irregular route skirting cape close to Whitby
- At first, performance by hybrid yacht is variable
- Inconsistent chap, extremely tidy but disorganised
- Erratic progress, initially, by yacht at sea
- Often repaired, but irregularly
- Yacht with power supply that’s irregular
- Like something sewn on uniform? No
- Yacht sailing from Portugal; sometimes rough, sometimes smooth
- Not even Irishman goes to church before start of Yule
- Often repaired, but it’s irregular
Buddy explains!

The straight part
We know that "Inconsistent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case inconsistent = patchy.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 PATCHY mean?
PATCHY adjective- Full of, or covered with, patches; abounding in patches.
- Not constant or continuous; intermittent or uneven.