The most common and most likely answer to this crossword clue is the 6 plus 5 plus 4 letter word YELLOW BRICK ROAD
I've seen this crossword clue in The Guardian
Y
E
L
L
O
W
B
R
I
C
K
R
O
A
D
More clues leading to the result YELLOW BRICK ROAD
- ... or reliable person on staff seizing a path to fortune
- A way to get rich? Fearful woman in US describes twist
- One dollar 1 across wanting inoculation to show the way to fantastic city
- Path to 6 and 23 coloured 12 and black beside haystack, by the way
- Daft, cowardly or like robot in the heart? Walk this way!
Buddy explains!
The straight part
We know that "the way to fantastic city" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the way to fantastic city = yellow brick road.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.