Composition in middle of test, for example (5)
I believe the answer is:
essay
'composition' is the definition.
(thesaurus)
'middle of test for example' is the wordplay.
'middle of' indicates the central letters.
'for example' becomes 'say' (I've seen this before).
The middle letters of 'test' are 'es'.
'es'+'say'='ESSAY'
'in' acts as a link.
(Other definitions for essay that I've seen before include "Analytic or interpretive literary composition (5_" , "Old experiment" , "Attempt, try" , "Test" , "Try; a piece of writing" .)