Long time with northern Conservative getting unknown sales interests (6)
I believe the answer is:
agency
'sales interests' is the definition.
(an agency might sell things)
'long time with northern conservative getting unknown' is the wordplay.
'long time' becomes 'age' (an age is a period of time).
'with' is a charade indicator (letters next to each other).
'northern conservative' becomes 'nc' (this might be a standard abbreviation I've not previously seen).
'getting' says to put letters next to each other.
'unknown' becomes 'y' (algebra).
'age'+'nc'+'y'='AGENCY'
Can you help me to learn more?
(Other definitions for agency that I've seen before include "Administrative unit" , "Instrumentality, operation" , "Employment bureau" , "Recruitment bureau" , "Office or business of one who does business for others" .)