The most common and most likely answer to this crossword clue is the 5 letter word STASH
S
T
A
S
H
More clues leading to the result STASH
- Burned remains after emptying secret store
- Walrus remains under stone
- Admitting hot finally, scarf put away
- Hide of small walrus, perhaps
- Street tree provides hiding-place
- Hoard stone and timber
- Time to enter band’s store
- … drugs hoard in “stone tree”
- Residue after street collection
- Band keeping close to airport for drugs consignment
Buddy explains!

The straight part
We know that "collection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case collection = stash.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 STASH mean?
STASH noun- A collection, sometimes hidden; a reserve.
- A place where drugs are stored.
- To hide or store away for later use.
- Mustache