Deserve a new timer (5)
I believe the answer is:
merit
'deserve' is the definition.
(I know that deserve can be written as merit)
'a new timer' is the wordplay.
'a new' is an anagram indicator.
'timer' with letters rearranged gives 'MERIT'.
(Other definitions for merit that I've seen before include "Goodness" , "Quality deserving reward" , "of a high order?" , "Advantage" , "Just deserts" .)