New pain after switching silver filling (7)
I believe the answer is:
ganache
'filling' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'new pain after switching silver' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'pain' becomes 'ache' (ache is a kind of pain).
'after' is a charade indicator (letters next to each other).
'switching' is a reversal indicator (switching direction).
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'ag' back-to-front is 'ga'.
'n'+'ache'='nache'
'nache' put after 'ga' is 'GANACHE'.
Can you help me to learn more?
(Another definition for ganache that I've seen is " chocolate filling".)