The most common and most likely answer to this crossword clue is the 8 letter word HEELTAPS
I've seen this crossword clue in The Daily Telegraph
H
E
E
L
T
A
P
S
Buddy explains!
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 HEELTAPS mean?
HEELTAPS noun- A piece or wedge that raises the heel of a shoe.
- A small amount of (especially alcoholic) drink remaining at the bottom of a glass.