Crossword Genius

Reverse: regret road crumbling (10)

Ross

I believe the answer is:

retrograde

'reverse' is the definition.
(thesaurus)

'regret road crumbling' is the wordplay.
'crumbling' indicates an anagram.
'regret'+'road'='regretroad'
'regretroad' with letters rearranged gives 'RETROGRADE'.

(Other definitions for retrograde that I've seen before include "Moving backwards" , "degenerate" , "Going back" , "Declining" , "Reverse" .)

I've seen this clue in The Telegraph.
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