The most common and most likely answer to this crossword clue is the 6 plus 2 plus 4 letter word GARDEN OF EDEN
I've seen this crossword clue in The Daily Telegraph
G
A
R
D
E
N
O
F
E
D
E
N
More clues leading to the result GARDEN OF EDEN
Buddy explains!
The straight part
We know that "The back of Number Ten in the 1950s/A tempting location" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the back of number ten in the 1950s/a tempting location = garden of eden.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.