Silver bullet landed accidentally (7)
I believe the answer is:
aground
'landed accidentally' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can sometimes define each other.
'silver bullet' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'bullet' becomes 'round' (I've seen this in another clue).
'ag'+'round'='AGROUND'
Can you help me to learn more?
(Other definitions for aground that I've seen before include "(Of a ship) stuck on the seabed" , "Like a stranded ship" , "No longer floating" , "on the bed" , "having hit rock bottom, perhaps" .)