Boy grabs right back, man of the match in well-defended area (10)
I believe the answer is:
strongroom
'area' is the definition.
(strongroom is a kind of area)
'boy grabs right back man of the match in' is the wordplay.
'boy' becomes 'ron' (short for Ronald).
'grabs right back' becomes 'st' (I can't justify this - if you can you should believe this answer much more).
'man of the match' becomes 'groom' (I've seen this before).
'in' is an insertion indicator.
'st'+'groom'='stgroom'
'ron' put within 'stgroom' is 'STRONGROOM'.
'well-defended' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for strongroom that I've seen before include "safe place" , "Bank vault" .)