Restrained in two ways (6)
I believe the answer is:
modest
'restrained' is the definition.
(synonyms)
'two ways' is the wordplay.
'two ways' can mean two substitutions for 'way'.
'way' becomes 'mode' (synonyms).
'way' becomes 'st' (abbreviation for street).
'mode'+'st'='MODEST'
'in' is the link.
(Other definitions for modest that I've seen before include "Humble, unpretentious" , "Unassuming or decent" , "'Unassuming, diffident (6)'" , "Humble, meek or plain" , "Native of Vienna" .)