Feel becalmed around river (4)
I believe the answer is:
elbe
'river' is the definition.
(river in Germany)
'feel becalmed around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'ELBE' can be found hidden inside 'feel becalmed'.
(Other definitions for elbe that I've seen before include "Dresden/Hamburg river" , "River of Germany" , "Flower" , "It flows through Germany" , "Dresden and Hamburg's river" .)