Royal name offering small change in second rule (7)
I believe the answer is:
spencer
'royal name' is the definition.
The definition suggests a singular noun which matches the answer.
'small change in second rule' is the wordplay.
'small change' becomes 'pence' (pennies).
'in' is an insertion indicator.
'second' becomes 's' (common abbreviation).
'rule' becomes 'r' (legal abbreviation).
's'+'r'='sr'
'pence' put within 'sr' is 'SPENCER'.
'offering' is the link.
Can you help me to learn more?
(Other definitions for spencer that I've seen before include "Tracy in Hollywood" , "Churchill's name" , "thin woollen vest" , "philosopher" , "British painter" .)