Conservative supporter accumulating money without fuss (6)
I believe the answer is:
calmly
'without fuss' is the definition.
'conservative supporter accumulating money' is the wordplay.
'conservative' becomes 'c' (abbreviation commonly used in UK politics).
'supporter' becomes 'ally' (I've seen this before**).
'accumulating' indicates putting letters inside.
'money' becomes 'm' (abbreviation in economics).
'ally' enclosing 'm' is 'almly'.
'c'+'almly'='CALMLY'
(Other definitions for calmly that I've seen before include "Unflappably" , "Quietly, placidly" , "Serenely" , "In quiet unexcited manner" , "In a peaceful manner" .)