The most common and most likely answer to this crossword clue is the 7 letter word EYEWASH
I've seen this crossword clue in The Times
E
Y
E
W
A
S
H
More clues leading to the result EYEWASH
- Rot in heart of beech and another couple of trees
- Observer cleaner? Nonsense!
- Rubbish solution for irritated viewers
- English trees? Nonsense
- We say he disposed of rubbish
- Blarney Stone finally located next to trees
- Earth and two trees – this is soothing sight
- Emollient primarily put on two types of wood, cleansing lotion
- Rot in English trees
- England’s first two trees? Nonsense!
Buddy explains!

The straight part
We know that "Observer cleaner/Nonsense" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case observer cleaner/nonsense = eyewash.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 EYEWASH mean?
EYEWASH noun- A soothing medicated lotion for the eyes
- Nonsense; flattery; pretentiousness.
- To fool with nonsense or flattery.
- (intelligence) To keep information secret by sending false information to many people in one's own organization, and correct information to a select few.