Solution that’s popular and in no way peculiar (7)
I believe the answer is:
nostrum
'solution that's popular' is the definition.
(a supposed cure or solution)
'no way peculiar' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'peculiar' becomes 'rum' (synonyms).
'no'+'st'+'rum'='NOSTRUM'
'and in' acts as a link.
(Other definitions for nostrum that I've seen before include "Favourite remedy or scheme" , "secret potion" , "Simple, remedy" , "Patent medicine with questionable efficacy" , "Some think it helps" .)