Again, bust chair? (8)
I believe the answer is:
rearrest
'chair?' is the definition.
The answer and definition are not the same part of speech.
'again bust' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'bust' becomes 'arrest' (I've seen this in another clue).
're'+'arrest'='REARREST'
(Other definitions for rearrest that I've seen before include "put in custody again!" , "Second seizure" .)