Hotlines got crossed for student of culture (11)
I believe the answer is:
ethnologist
'student of culture' is the definition.
(an ethnologist studies different cultures)
'hotlines got crossed' is the wordplay.
'crossed' indicates an anagram.
'hotlines'+'got'='hotlinesgot'
'hotlinesgot' with letters rearranged gives 'ETHNOLOGIST'.
'for' acts as a link.
(Other definitions for ethnologist that I've seen before include "One studying different peoples" , "Studier of different peoples" , "Race expert" , "Student of races and peoples" .)