The most common and most likely answer to this crossword clue is the 6 plus 5 letter word GROUND FLOOR
G
R
O
U
N
D
F
L
O
O
R
Buddy explains!
The straight part
We know that "where lift starts?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case where lift starts? = ground floor.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 GROUND FLOOR mean?
GROUND FLOOR adjective- Situated on the ground floor