Uncommon sign of injury — Anglicans providing support (6)
I believe the answer is:
scarce
'uncommon' is the definition.
(I've seen this before)
'sign of injury anglicans providing support' is the wordplay.
'sign of injury' becomes 'scar' (I've seen this before).
'anglicans' becomes 'ce' (Church of England).
'providing support' means one lot of letters go next to another (in a down clue, some letters go beneath others).
'scar'+'ce'='SCARCE'
(Other definitions for scarce that I've seen before include "exceptional" , "Rarely seen" , "Not plentiful, in short supply" , "Hard to obtain" , "Not often found" .)