The most common and most likely answer to this crossword clue is the 6 letter word CORRIE
I've seen this crossword clue in Financial Times
C
O
R
R
I
E
More clues leading to the result CORRIE
Buddy explains!
The straight part
We know that "Soap/basin" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case soap/basin = corrie.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 CORRIE mean?
CORRIE noun- A bowl-shaped geographical feature formed by glaciation.