On account of test, short prayer required, say (3,7)
I believe the answer is:
for example
'say' is the definition.
(I've seen this before)
'on account of test short prayer' is the wordplay.
'on' says to put letters next to each other.
'account of' becomes 'for' (I've seen this in other clues).
'test' becomes 'exam' ('exam' can be a synonym of 'test'**).
'short' means to remove the last letter.
'prayer' becomes 'plea' (plea is a kind of prayer).
'plea' with its last letter removed is 'ple'.
'for'+'exam' is 'forexam'.
'forexam'+'ple'='FOR EXAMPLE'
'required' is the link.
(Other definitions for for example that I've seen before include "By way of illustration" , "Speed" , "Say" .)