R Reagan scuppered schedule (7)
I believe the answer is:
arrange
'schedule' is the definition.
(I've seen this in another clue)
'r reagan scuppered' is the wordplay.
'scuppered' indicates an anagram ('scuppered' can mean wrecked).
'r'+'reagan'='rreagan'
'rreagan' is an anagram of 'ARRANGE'.
(Other definitions for arrange that I've seen before include "Orchestrate - order" , "Put in order; plan" , "Organise, plan" , "Set in order" , "Fix" .)