Scare off worries (5)
I believe the answer is:
cares
'worries' is the definition.
(I've seen this before)
'scare off' is the wordplay.
'off' indicates an anagram.
'scare' anagrammed gives 'CARES'.
(Other definitions for cares that I've seen before include "Worries, anxieties" , "Has concerns or interest" , "Minds" , "Feels interest or concern" .)