The most common and most likely answer to this crossword clue is the 5 plus 3 letter word GUIDE DOG
I've seen this crossword clue in The Guardian
G
U
I
D
E
D
O
G
More clues leading to the result GUIDE DOG
- Tailed conductor?
- Girl in group to follow one trained to lead
- Visual aid for leader on track?
- An animal looking for his master
- Girl Scout, to do good, provides a help for one who’s blind
- 9 possibly led before own goal
- One having lead to provide vision?
- By the sound it, chap had briefly to follow aid for mobility
- Scots commended, say, about party for disability supporter
- Shepherd to follow blindly?
Buddy explains!
The straight part
We know that "Visual aid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case visual aid = guide dog.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.