The most common and most likely answer to this crossword clue is the 11 letter word PITCH-BLACK
I've seen this crossword clue in Independent
P
I
T
C
H
-
B
L
A
C
K
More clues leading to the result PITCH-BLACK
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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 PITCH-BLACK mean?
PITCH-BLACK adjective- Very dark; without light.