The most common and most likely answer to this crossword clue is the 8 letter word SPYGLASS
S
P
Y
G
L
A
S
S
More clues leading to the result SPYGLASS
- It helps one observe end of alluring girl linked to 007?
- Help for viewer turning over colossal gypsum exhibits
- With this telescope, secretly watch grand girl
- Returning traveller docked to find girl, getting lookout's aid
- Telescope upset mostly Bohemian young woman
- Traveller briefly repelled girl viewer
- Sleeper with composer’s visual aid?
- Initially, sharp back pain, when getting onto girl’s telescope
- Notice mirror in telescope
- Girl beneath base of lens having trouble looking up telescope
Buddy explains!

The straight part
We know that "lookout's aid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lookout's aid = spyglass.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 SPYGLASS mean?
SPYGLASS noun- A small portable telescope.
- A pair of binoculars.