Commonly named (2-6)
I believe the answer is:
so-called
'commonly named' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for so-called that I've seen before include "Commonly labelled" , "Named or styled as" , "Referred to by description open to question" , "Doubtful -- suspect" , "Popularly known as" .)