Worried tense Democrat supporting currency (8)
I believe the answer is:
troubled
'worried' is the definition.
(synonyms)
'tense democrat supporting currency' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'democrat' becomes 'd'.
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'currency' becomes 'rouble' (Russian rouble).
'd' put after 'rouble' is 'roubled'.
't'+'roubled'='TROUBLED'
(Other definitions for troubled that I've seen before include "Bothered, perturbed" , "Disquieted, upset" , "Worried" , "Inconvenienced" , "Distressed, perturbed" .)