Rock singer’s over aged, making fusion (9)
I believe the answer is:
soldering
'fusion' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'rock singer's over aged' is the wordplay.
'rock' indicates anagramming the letters (the solver must 'rock' the letters around).
'over' is an insertion indicator.
'aged' becomes 'old' (similar in meaning).
'singer' with letters rearranged gives 'sering'.
'sering' placed around 'old' is 'SOLDERING'.
'making' is the link.
Can you help me to learn more?
(Other definitions for soldering that I've seen before include "Getting heatedly attached" , "Joining" .)