Give an account of soldiers deceased (6)
I believe the answer is:
relate
'give an account' is the definition.
(I've seen this before)
'soldiers deceased' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'deceased' becomes 'late' (I've seen this before).
're'+'late'='RELATE'
'of' acts as a link.
(Other definitions for relate that I've seen before include "Make a logical or casual connection" , "Describe an event" , "feel empathy" , "Give account of (story)" , "Narrate, tell in detail" .)