Cryptic crossword clue
Young fireflies unexpectedly grow slow around first of May 9

The most common and most likely answer to this crossword clue is the 9 letter word GLOWWORMS

G
L
O
W
W
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M
S

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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 GLOWWORMS mean?

GLOWWORMS noun
  1. The larva or wingless grub-like female of a beetle from the families Phengodidae or Lampyridae that gives out a green light from its abdomen.
  2. A carnivorous gnat larva in the keroplatid genus Arachnocampa that spins threads to capture insects attracted by its glow.

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