Suddenly appear to smash lid (5,5)
I believe the answer is:
break cover
'suddenly appear' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'smash lid' is the wordplay.
'smash' becomes 'break' (I've seen this before).
'lid' becomes 'cover' (I've seen this before).
'break'+'cover'='BREAK COVER'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for break cover that I've seen before include "Come in to open" , "Come out of hiding" , "Be clearly out" .)