Song played accurately with no weak point (8)
I believe the answer is:
airtight
'song played accurately with no weak point' is the definition.
I can't tell whether this defines the answer.
'song played accurately with no weak point' is the wordplay.
'song' becomes 'air' (I've seen this before).
'played accurately with no weak point' becomes 'tight' (I can't explain this - if you can you should believe this answer much more).
'air'+'tight'='AIRTIGHT'
Can you help me to learn more?
(Other definitions for airtight that I've seen before include "Hermetically sealed" , "Impenetrable" , "Totally sealed" , "beyond question" , "Not allowing gas to enter or escape" .)