Extremely dirty and repugnant old soap (7)
I believe the answer is:
dynasty
'soap' is the definition.
(I know that Dynasty is a soap)
'extremely dirty and repugnant' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'and' means one lot of letters go next to another.
'repugnant' becomes 'nasty' (I've seen this in another clue).
'dirty' with its centre taken out is 'dy'.
'dy'+'nasty'='DYNASTY'
'old' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for dynasty that I've seen before include "Line of hereditary rulers" , "Song, say" , "Sequence of powerful leaders in the same family" , "Song perhaps" , "royal family" .)