Rest period brings southern sailor to city (7)
I believe the answer is:
sabbath
'rest period' is the definition.
'sabbath' can be an answer for 'period' (Sabbath is an example). I'm unsure of the 'rest' bit.
'southern sailor to city' is the wordplay.
'southern' becomes 's' (abbreviation).
'sailor' becomes 'ab' (abbreviation for able seaman).
'to city' becomes 'bath' (English city).
's'+'ab'+'bath'='SABBATH'
'brings' is the link.
Can you help me to learn more?
(Other definitions for sabbath that I've seen before include "Hebrew word for day of rest" , "Religious day of rest for Jews and Christians" , "Jewish rest-day" , "Traditional holy day" , "Period of rest" .)