See further military action, but not the front line (7)
I believe the answer is:
reserve
'see further' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'military action but not the front line' is the wordplay.
I cannot quite understand how this works, but
'military' could be 're' (Royal Engineers) and 're' is found within the answer.
'action' could be 'serve' (serve is a kind of action) and 'serve' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for reserve that I've seen before include "Book - spare player" , "put to one side" , "Savings - book" , "left on the bench?" , "8 [RESTRAINT]" .)