Let it stand the test, maybe (4)
I believe the answer is:
stet
'let it stand' is the definition.
(I've seen this before)
'test maybe' is the wordplay.
'maybe' indicates an anagram.
'test' is an anagram of 'STET'.
'the' is the link.
(Other definitions for stet that I've seen before include "Restorative direction needed" , "Eg, molar" , "Instruction to ignore amendment" , "Leave in, as text" , "Let it stand (L)" .)