Rush to secure politician promotion and bit of capital (9)
I believe the answer is:
hampstead
'bit of capital' is the definition.
The definition suggests a singular noun which matches the answer.
'rush to secure politician promotion' is the wordplay.
'rush' becomes 'haste' (synonyms).
'to secure' means one lot of letters goes inside another (inserted letters are secured inside).
'politician' becomes 'MP' (Member of Parliament).
'promotion' becomes 'ad' (short for advert).
'haste' placed around 'mp' is 'hampste'.
'hampste'+'ad'='HAMPSTEAD'
'and' is the link.
Can you help me to learn more?
(Other definitions for hampstead that I've seen before include "part of London" , "London district" .)