Eddie saves our group in river (5)
I believe the answer is:
tweed
'river' is the definition.
(I've seen this before)
'eddie saves our group' is the wordplay.
'eddie' becomes 'ted' (I am not sure about this - if you are sure you should believe this answer much more).
'saves' indicates putting letters inside.
'our group' becomes 'we' (we or us).
'ted' going around 'we' is 'TWEED'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tweed that I've seen before include "flows across a border" , "Material; river" , "Scottish/English river" , "Twilled cloth" , "Thick woolen fabric" .)