Relax, unusually, in the morning after old test (4,4)
I believe the answer is:
oral exam
'test' is the definition.
(oral exam is a kind of test)
'relax unusually in the morning after old' is the wordplay.
'unusually' is an anagram indicator.
'in the morning' becomes 'am'.
'after' says to put letters next to each other.
'old' becomes 'o' (common abbreviation eg in OE for Old English**).
'relax' with letters rearranged gives 'ralex'.
'ralex'+'am'='ralexam'
'ralexam' put after 'o' is 'ORAL EXAM'.
(Another definition for oral exam that I've seen is " Viva voce test".)