Speech made in summer month by Russian river (9)
I believe the answer is:
inaugural
'speech' is the definition.
(inaugural is a kind of speech)
'in summer month by russian river' is the wordplay.
'summer month' becomes 'aug' (short for August).
'by' says to put letters next to each other.
'russian river' becomes 'ural' (I've seen this before).
'in'+'aug'+'ural'='INAUGURAL'
'made' acts as a link.
(Other definitions for inaugural that I've seen before include "It may be delivered" , "Relating to start of job or course" , "Of a ceremony officially marking the beginning of something" , "First address" , "Maiden" .)