Ten really troubled always (9)
I believe the answer is:
eternally
'always' is the definition.
(eternally means always)
'ten really troubled' is the wordplay.
'troubled' indicates an anagram.
'ten'+'really'='tenreally'
'tenreally' with letters rearranged gives 'ETERNALLY'.
(Other definitions for eternally that I've seen before include "constantly" , "For evermore" , "all the time" , "Always and ever" , "for good" .)