Cryptic crossword clue
Spread butter, with end of knife that’s used to deliver liquid 7

The most common and most likely answer to this crossword clue is the 7 letter word BURETTE

I've seen this crossword clue in The Guardian
B
U
R
E
T
T
E

Buddy explains!

The straight part
We know that "used to deliver liquid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case used to deliver liquid = burette.
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 BURETTE mean?

BURETTE noun
  1. A glass tube with fine gradations and a stopcock at the bottom, used in laboratory procedures for accurate fluid dispensing and titration.
  2. An altar cruet.

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