Officer involved in recount (9)
I believe the answer is:
centurion
'officer' is the definition.
(I have seen 'Old officer' mean 'centurion' so perhaps 'officer' could also mean 'centurion')
'involved in recount' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'in'+'recount'='inrecount'
'inrecount' with letters rearranged gives 'CENTURION'.
(Other definitions for centurion that I've seen before include "Leading Roman" , "Commander in ancient Rome" , "Roman leader of 100 soldiers" , "roman soldier" , "Nocturne I played for old Roman army officer" .)