21 down
Roger
backing
strike
for
change
in
Russia
(6)
Roger backing strike for change in Russia (6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at change in Russia — that's your definition, pointing to the Russian coin. Roger gives you OK, which gets reversed by "backing" to give KO, then you add PECK meaning strike, and the whole lot together makes KOPECK.