Language difficulty over -- seem worried (7)
I believe the answer is:
burmese
'language' is the definition.
(Burmese is an example)
'difficulty over seem worried' is the wordplay.
'difficulty' becomes 'rub' (rub can mean a difficulty or problem).
'over' says the letters should be written in reverse.
'worried' indicates an anagram (worry can mean to interfere with or disturb).
'rub' back-to-front is 'bur'.
'seem' is an anagram of 'mese'.
'bur'+'mese'='BURMESE'
(Other definitions for burmese that I've seen before include "Asians" , "Native to Myanmar" , "Breed of cat" .)