The most common and most likely answer to this crossword clue is the 3 letter word TAD
I've seen this crossword clue in The Guardian
T
A
D
More clues leading to the result TAD
- Little daughter pursuing volunteers
- A little bit of information shortly picked up
- A little information should come back shortly
- A bit of time given to something in TV break?
- Touch nothing removed from hopper
- Initially take away drop: a small amount
- Little thanks given to daughter
- Partly mishit a drive — small slice, say
- Touch the heart of secret admirer
- … small amount of information briefly recalled
Buddy explains!

The straight part
We know that "small slice, say" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case small slice, say = tad.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 TAD mean?
TAD noun- A small amount; a little bit.
- A street boy; an urchin.