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All answers having "Immediately!" as clue:

3 Character Answers:

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NOW

PDQ



4 Character Answers:

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ANON

ASAP

COLT

STAT

UPON



5 Character Answers:

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AISLE

EMEND

LADEN

TODAY



6 Character Answers:

---

ATONCE

HEIGHT

PRESTO

PRONTO

SHRIMP

ZOMBIE



7 Character Answers:

---

ITERATE

SOONEST

WHEREAS



8 Character Answers:

---

ASSOONAS



9 Character Answers:

---

FORTHWITH

INSTANTLY

ONTHELINE

ONTHESPOT

RIGHTAWAY



10 Character Answers:

---

HEREANDNOW



11 Character Answers:

---

INANINSTANT



12 Character Answers:

---

STRAIGHTAWAY

THENANDTHERE

THEREANDTHEN



14 Character Answers:

---

RIGHTOFFTHEBAT



15 Character Answers:

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ATTHEDROPOFAHAT

RIGHTTHISSECOND