River foremen abandoning river (6)
I believe the answer is:
ganges
'river' is the definition.
(Ganges is an example)
'foremen abandoning river' is the wordplay.
'foremen' becomes 'gangers' (ganger is a kind of foreman).
'abandoning' indicates named letters should be taken away.
'river' becomes 'r'.
'gangers' with 'r' taken away is 'GANGES'.
(Other definitions for ganges that I've seen before include "Asian flower" , "Sacred Hindu river in India" , "River flowing into the Bay of Bengal" , "Sacred Indian river" , "Holy Indian river" .)