The most common and most likely answer to this crossword clue is the 12 letter word CATERPILLARS
I've seen this crossword clue in The Daily Telegraph
C
A
T
E
R
P
I
L
L
A
R
S
More clues leading to the result CATERPILLARS
- Provide sustenance on posts for insects
- Provide food for prominent supporter pursued by small creatures
- Some creep munching gum leaves
- They make tracks for these garden bugs
- Crate’s broken down, support’s in vehicles making tracks
- Many-legged larvae tracks
- Crawlers with hundred legs, hiding a butterfly at heart
Buddy explains!

The straight part
We know that "tracks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tracks = caterpillars.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 CATERPILLARS mean?
CATERPILLARS noun- The larva of a butterfly or moth; leafworm.
- A vehicle with a caterpillar track; a crawler.