Conspicuous way to involve stranger (7)
I believe the answer is:
salient
'conspicuous' is the definition.
(similar in meaning)
'way to involve stranger' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'to involve' is an insertion indicator (inserted letters get involved).
'stranger' becomes 'alien' (synonyms).
'st' enclosing 'alien' is 'SALIENT'.
(Other definitions for salient that I've seen before include "Leaping (heraldry)" , "Entails (anag) - most important" , "Foremost" , "Projecting outwards; significant" , "Outstanding - it's lean (anag)" .)