Try out translation of psalm by evangelical leader (6)
I believe the answer is:
sample
'try out' is the definition.
(synonyms)
'translation of psalm by evangelical leader' is the wordplay.
'translation of' indicates anagramming the letters (I've seen this in other clues).
'by' means one lot of letters go next to another.
'leader' suggests taking the first letters.
The initial letter of 'evangelical' is 'e'.
'psalm' with letters rearranged gives 'sampl'.
'sampl'+'e'='SAMPLE'
(Other definitions for sample that I've seen before include "Small representative piece" , "Taste; specimen" , "Take" , "Representative portion" , "Model" .)