Odds on getting good service (8)
I believe the answer is:
evensong
'service' is the definition.
(thesaurus)
'odds on getting good' is the wordplay.
'odds' becomes 'evens' (I've seen this before).
'getting' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'evens'+'on'+'g'='EVENSONG'
(Other definitions for evensong that I've seen before include "6 [SERVICE] ?" , "Late afternoon church service" , "Religious service" , "Vespers" , "... Prayers" .)