Nevertheless a way to get sick (5)
I believe the answer is:
still
'nevertheless' is the definition.
(synonyms)
'a way to get sick' is the wordplay.
'a way' becomes 'st' (abbreviation for street).
'to get' is a charade indicator (letters next to each other).
'sick' becomes 'ill' (synonyms).
'st'+'ill'='STILL'
(Other definitions for still that I've seen before include "Even now; not moving" , "Unmoving yet" , "not bubbly" , "Stationary" , "Source of alcohol" .)