Crossword Genius

Toppling Trojan King: to me, it's a serious business (2,6,6)

Ross

I believe the answer is:

no joking matter

'a serious business' is the definition.

'toppling trojan king to me' is the wordplay.
'toppling' indicates anagramming the letters (I've seen 'toppled' mean this (the order of letters topples or collapses)).
'trojan'+'king'+'to'+'me'='trojankingtome'
'trojankingtome' anagrammed gives 'NO JOKING MATTER'.

'it's' acts as a link.

I've seen this clue in The Everyman puzzle in The Observer.
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