A lure, reportedly, to become less intense (5)
I believe the answer is:
abate
'become less intense' is the definition.
(I've seen this before)
'a lure reportedly' is the wordplay.
'lure' becomes 'bait' (baiting is a kind of luring).
'reportedly' indicates a 'sounds like' (homophone) clue.
'bait' is a homophone of 'bate'.
'a'+'bate'='ABATE'
'to' acts as a link.
(Other definitions for abate that I've seen before include "Lessen in intensity" , "Let up or die away" , "Subside, grow less" , "Ease off" , "Become less strong like storm" .)