Relaxed in odd parts of exam, say (4)
I believe the answer is:
easy
'relaxed' is the definition.
(associated in meaning)
'odd parts of exam say' is the wordplay.
'odd parts of' indicates alternate letters (letters in odd-numbered positions).
'exam'+'say'='examsay'
The alternate letters of 'examsay' are 'EASY'.
'in' is the link.
(Other definitions for easy that I've seen before include "Requiring little effort" , "Simply achieved" , "in plentiful supply" , "Men may be told to stand thus" , "Achieved without effort" .)