Crossword Genius

Soldier waits on reinforcements (8)

Ross

I believe the answer is:

reserves

'reinforcements' is the definition.
(thesaurus)

'soldier waits on' is the wordplay.
'soldier' becomes 're' (Royal Engineer).
'waits on' becomes 'serves' (to wait on someone is to serve them).
're'+'serves'='RESERVES'

(Other definitions for reserves that I've seen before include "Stockpiles" , "group of people for backup?" , "Books" .)

I've seen this clue in The Guardian.
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