Rouse again when a new rake is broken (8)
I believe the answer is:
reawaken
'rouse again' is the definition.
(I've seen this before)
'a new rake is broken' is the wordplay.
'is broken' indicates anagramming the letters.
'a'+'new'+'rake'='anewrake'
'anewrake' with letters rearranged gives 'REAWAKEN'.
'when' acts as a link.
(Other definitions for reawaken that I've seen before include "Rouse again from sleep" , "Arouse again, interest say" , "Bring to life again" , "spring again" , "Revive" .)