The most common and most likely answer to this crossword clue is the 2 plus 5 letter word IN VITRO
I've seen this crossword clue in Financial Times
I
N
V
I
T
R
O
More clues leading to the result IN VITRO
- Possibly using medium of culture noire, short ITV broadcast
- Briefly ask men to retire somewhere for experiment?
- Come close to inviting troops to go north for what’s in the lab
- Nearly summon troops back using lab equipment
- Like chemical solutions often shortening life in medicine container
- At home to Victoria, with CIA going crazy under laboratory conditions
- Where reaction might occur when opening bars around 6
- Outside body very involved in rioting — bad, not good
- Variation at sea excluding areas where life, for some, began
- Almost call couple of Romans in artificial environment
Buddy explains!
The straight part
We know that "what’s in the lab" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what’s in the lab = in vitro.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.