Let it stand the test somehow (4)
I believe the answer is:
stet
'let it stand' is the definition.
(I've seen this before)
'test somehow' is the wordplay.
'somehow' is an anagram indicator.
'test' anagrammed gives 'STET'.
'the' is the link.
(Other definitions for stet that I've seen before include "Instruction to cancel a deletion" , "Direction in printing to cancel a correction or deletion" , "Leave in, as text" , "Editorial instruction meaning "let it stand"" , "Editing instruction that matter marked for deletion is to be retained" .)