See defeated person with Postecoglou in the immediate vicinity (5,5)
I believe the answer is:
close range
'the immediate vicinity' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'see defeated person with postecoglou' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'defeated person' becomes 'loser' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'postecoglou' becomes 'ange' (I can't justify this - if you can you should believe this answer much more).
'c'+'loser'+'ange'='CLOSE-RANGE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for close range that I've seen before include "Ban use of guns" , "Nearby" , "short distance to target" .)