Supported right through, when one left the straight and narrow (7)
I believe the answer is:
strayed
'supported right' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe you can see an association between them that I don't see?
'when one left the straight and narrow' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'one' becomes 'a' (a thing is one thing).
'left' is a deletion indicator (some letters have left).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'straight and narrow' becomes 'rayed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'as' with 'a' taken out is 's'.
's'+'t'+'rayed'='STRAYED'
'through' is the link.
Can you help me to learn more?
(Other definitions for strayed that I've seen before include "Wandered away" , "Went off violin" , "Wandered off course" , "Erred, wandered" , "Dry seat (anag) - got lost" .)