Leaves war secrets out (10)
I believe the answer is:
watercress
'leaves' is the definition.
(edible leaves)
'war secrets out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'war'+'secrets'='warsecrets'
'warsecrets' anagrammed gives 'WATERCRESS'.
(Other definitions for watercress that I've seen before include "Salad vegetable" , "salad ingredient" , "Salad plant" , "low-calorie food" , "bit of salad" .)