Cryptic crossword clue
Uranium and lithium detected in lettuce purée 6

The most common and most likely answer to this crossword clue is the 6 letter word COULIS

C
O
U
L
I
S

Buddy explains!

The straight part
We know that "purée" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case purée = coulis.
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 COULIS mean?

COULIS noun
  1. A thick sauce made with pureed vegetable or fruit and often used as a garnish.

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