The most common and most likely answer to this crossword clue is the 8 letter word ROLL-ONS
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More clues leading to the result ROLL-ONS
Buddy explains!

The straight part
We know that "they help with applications" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they help with applications = roll-ons.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 ROLL-ONS mean?
ROLL-ONS noun- (often in the plural) A type of corset which is rolled on to the body.
- A cosmetic product (especially a deodorant) applied by means of a ball at the head of a container, which rolls the product on to the skin etc.