New diamonds found in hoard scattered somewhere in Wales (7)

I believe the answer is:
rhondda
'somewhere in wales' is the definition.
The definition suggests a singular noun which matches the answer.
'new diamonds found in hoard scattered' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'diamonds' becomes 'd' (abbreviation for the card suit diamonds).
'found in' is an insertion indicator.
'scattered' indicates an anagram.
'n'+'d'='nd'
'hoard' with letters rearranged gives 'rhoda'.
'nd' placed inside 'rhoda' is 'RHONDDA'.
Can you help me to learn more?
(Other definitions for rhondda that I've seen before include "Former mining valley in Wales" , "Place in Wales" , "South Wales valley" , "Glamorgan valley" , "Welsh area renowned for coal mining" .)
