The most common and most likely answer to this crossword clue is the 5 letter word FLECK
I've seen this crossword clue in The Guardian
F
L
E
C
K
More clues leading to the result FLECK
Buddy explains!

The straight part
We know that "Little bit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case little bit = fleck.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 FLECK mean?
FLECK noun- A flake
- A lock, as of wool.
- A small spot or streak; a speckle.
- To mark with small spots