Fresh information about sappers (5)
I believe the answer is:
green
'fresh' is the definition.
(thesaurus)
'information about sappers' is the wordplay.
'information' becomes 'gen' (gen is a kind of information**).
'about' indicates putting letters inside.
'sappers' becomes 're' (Royal Engineers).
'gen' placed around 're' is 'GREEN'.
(Other definitions for green that I've seen before include "Environmental - colour" , "Concerned with the environment in colourful way" , "Genre (anag.)" , "Immature" , "Inexperienced - olive coloured" .)