Ridiculed the conductor audibly (5)
I believe the answer is:
'ridiculed' is the definition.
('guy' can be a synonym of 'ridicule')
'conductor audibly' is the wordplay.
'conductor' becomes 'guide' (I've seen this before).
'audibly' shows a homophone (sound like).
'guide' sounds like 'GUYED'.
'the' is the link.
(Other definitions for guyed that I've seen before include "sent up" , "Secured with rope" , "Made fun of - kept in position by ropes" .)