Crossword Genius

Dot, shown to be silly, is dismissed conclusively (4,4)

Ross

I believe the answer is:

shot down

I'm a little stuck... Click here to teach me more about this clue!

'dismissed conclusively' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how they can define each other.

'dot shown to be silly' is the wordplay.
'to be silly' indicates anagramming the letters.
'dot'+'shown'='dotshown'
'dotshown' anagrammed gives 'SHOT DOWN'.

'is' is the link.

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app