The most common and most likely answer to this crossword clue is the 2 plus 2 plus 3 plus 4 letter word UP ON THE ROOF
I've seen this crossword clue in The Guardian
U
P
O
N
T
H
E
R
O
O
F
Buddy explains!
The straight part
We know that "Thatcher may be seen here/song by the Drifters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thatcher may be seen here/song by the drifters = up on the roof.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.