Service just the same, no good (8)
I believe the answer is:
evensong
'service' is the definition.
(type of church service)
'just the same no good' is the wordplay.
'just the same' becomes 'even so' (I've seen this in another clue).
'no good' becomes 'ng' (abbreviation).
'evenso'+'ng'='EVENSONG'
(Other definitions for evensong that I've seen before include "Vespers" , "... Prayers" , "Religious service" , "Church service late in the day" , "6 [SERVICE] ?" .)