Uniform given to relative before German prayers (8)
I believe the answer is:
evensong
'prayers' is the definition.
(thesaurus)
'uniform given to relative before german' is the wordplay.
'uniform' becomes 'even' (I've seen this before).
'given to' says to put letters next to each other.
'relative' becomes 'son' (son is a kind of relative**).
'before' is a charade indicator (letters next to each other).
'german' becomes 'g' (abbreviation).
'even'+'son'+'g'='EVENSONG'
(Other definitions for evensong that I've seen before include "Anglican service" , "6 [SERVICE] ?" , "Service of evening prayer in Church of England" , "... Prayers" , "Vespers" .)