Nevertheless halt sale, silly me! (3,3,4)
I believe the answer is:
all the same
'nevertheless' is the definition.
('all the same' can be a synonym of 'nevertheless')
'halt sale silly me' is the wordplay.
'silly' indicates an anagram.
'halt'+'sale'='haltsale'
'haltsale' anagrammed gives 'allthesa'.
'allthesa'+'me'='ALL THE SAME'
(Other definitions for all the same that I've seen before include "lacking in variety" , "Nevertheless - identical" , "In any event" , "like clones?" , "Not material" .)