Into test-playing again, in a way (6)
I believe the answer is:
street
'a way' is the definition.
(street is a kind of way)
'into test-playing again' is the wordplay.
'into' is an insertion indicator.
'playing' indicates an anagram.
'again' becomes 're' (prefix meaning 'again').
'test' with letters rearranged gives 'stet'.
'stet' enclosing 're' is 'STREET'.
'in' acts as a link.
(Other definitions for street that I've seen before include "Acceptability amongst the 'with it' young" , "Urban thoroughfare" , "Town road" , "Public road in a conurbation" , "- Arab; - light" .)