Show sappers some flesh (6)
I believe the answer is:
reveal
'show' is the definition.
(synonyms)
'sappers some flesh' is the wordplay.
'sappers' becomes 're' (Royal Engineers).
'some flesh' becomes 'veal' (I've seen this before).
're'+'veal'='REVEAL'
(Other definitions for reveal that I've seen before include "Tell the truth" , "window, in part" , "Show, uncover" , "Remove cover to display" , "Make known to others" .)