Inflexible Democrat on Swiss mountain (5)
I believe the answer is:
rigid
'inflexible' is the definition.
(I know that inflexible can be written as rigid)
'democrat on swiss mountain' is the wordplay.
'democrat' becomes 'd'.
'on' is a charade indicator (letters next to each other).
'swiss mountain' becomes 'rigi' (I've seen this in another clue).
'd' put after 'rigi' is 'RIGID'.
(Other definitions for rigid that I've seen before include "Frozen" , "unwilling to move" , "Hard" , "stern" , "Unable to bend" .)