Angry soldier pinching one's breakfast? (9)
I believe the answer is:
croissant
'breakfast?' is the definition.
(I've seen this before)
'angry soldier pinching one's' is the wordplay.
'angry' becomes 'cross' (cross can mean annoyed or angry).
'soldier' becomes 'ant' (soldier is a type of ant).
'pinching' means one lot of letters goes inside another (taking inside).
'one' becomes 'I' (Roman numeral).
'cross'+'ant'='crossant'
'crossant' going around 'i' is 'CROISSANT'.
(Other definitions for croissant that I've seen before include "Tasty crescent-shaped French bread roll" , "that baker turns out" , "Breakfast roll" , "Continental breakfast crescent" , "food item" .)