Tory Howard made silly sound for driving (10)

I believe the answer is:

roadworthy

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'silly sound for driving' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'tory howard made' is the wordplay.
'made' indicates an anagram.
'tory'+'howard'='toryhoward'
'toryhoward' anagrammed gives 'ROADWORTHY'.

Can you help me to learn more?

(Other definitions for roadworthy that I've seen before include "fit for the journey?" , "Safe to be driven" , "fit to drive" .)

I've seen this clue in The Independent.

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