Two groups of soldiers getting a little snack (7)
I believe the answer is:
rarebit
'snack' is the definition.
(I've seen this before)
'two groups of soldiers getting a little' is the wordplay.
'two groups of' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'soldiers' becomes 're' (Royal Engineers).
'getting' says to put letters next to each other.
'little' becomes 'bit' (a small bit).
're' put after 'a' is 'are'.
'r'+'are'+'bit'='RAREBIT'
Can you help me to learn more?
(Other definitions for rarebit that I've seen before include "Simple dish" , "Welsh snack" , "Cooked cheese on toast" , "Savoury dish of cheese on toast" , "Arbiter of traditional Welsh dish" .)