Crossword Genius

Cruel innovators cracked safe (15)

Ross

I believe the answer is:

uncontroversial

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'safe' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

'cruel innovators cracked' is the wordplay.
'cracked' indicates anagramming the letters.
'cruel'+'innovators'='cruelinnovators'
'cruelinnovators' with letters rearranged gives 'UNCONTROVERSIAL'.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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