International organisation records first soldier being treated (8)
I believe the answer is:
redcross
'international organisation' is the definition.
(I've seen this before)
'records first soldier being treated' is the wordplay.
'first soldier' becomes 's' (1st letter of 'soldier').
'being treated' is an anagram indicator.
'records'+'s'='recordss'
'recordss' is an anagram of 'REDCROSS'.
(Other definitions for redcross that I've seen before include "International organisation" , "Medical outfit" .)