Type of rock with gold and jade around Welsh area (9)
I believe the answer is:
glamorgan
'welsh area' is the definition.
The definition suggests a singular noun which matches the answer.
'type of rock with gold and jade around' is the wordplay.
'type of rock' becomes 'glam' (as in glam rock music).
'with gold' becomes 'or' ('or' is the heraldic name for gold. I am not sure about the 'with' bit.).
'and' means one lot of letters go next to another.
'jade' becomes 'nag' (synonyms).
'around' shows that the letters should be reversed in order.
'nag' back-to-front is 'gan'.
'glam'+'or'+'gan'='GLAMORGAN'
Can you help me to learn more?
(Other definitions for glamorgan that I've seen before include "Cricket club" , "Historic Welsh county (with cricket team)" , "part of Wales" , "Cricket side" , "part of the Principality" .)