Clue: They're literally fired explosively off field (9)
Answer: ARTILLERY
Explanation: They're literally fired explosively off field (9)
LITERALLY*. &lit, though with perhaps excessive verbiage in the cryptic reading to be perfect. The "field" is a battlefield. I was puzzled by the use of "they", but the first definition in Chambers is "offensive weapon**s** of war". *Oops, I missed the point here: the anagram is of LITERALLY FIRED minus FIELD, so there's no "excessive verbiage"