The most common and most likely answer to this crossword clue is the 6 letter word LARVAE
I've seen this crossword clue in Financial Times
L
A
R
V
A
E
More clues leading to the result LARVAE
- We go through Metamorphosis in Latin, a Bible of its age
- Second of Variations Ravel composed for 16 17A?
- Nymphs line a rave dancing?
- Bog area oddly contains river grubs
- Tiny creatures run inside volcanic rock before start of eruption
- The French rave about tadpoles, say
- Pressure from palaver about silkworms, perhaps
- They take silk before becoming high fliers
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 LARVAE mean?
LARVAE noun- An early stage of growth for some insects and amphibians, in which after hatching from their egg, insects are wingless and resemble a caterpillar or grub, and amphibians lack limbs and resemble fish.
- An animal in the aforementioned stage.
- A form of a recently born or hatched animal that is quite different from its adult stage.