---

All answers having "Truly" as clue:

3 Character Answers:

---

ADV

YEA



4 Character Answers:

---

AMEN

VERY



5 Character Answers:

---

ITSSO

NOLIE

QUITE

YOURS



6 Character Answers:

---

ADVERB

HONEST

INDEED

INFACT

ITISSO

REALLY

VERILY



7 Character Answers:

---

FORREAL

INFAITH

THINKSO



8 Character Answers:

---

FORAFACT

FORSOOTH

HONESTLY



9 Character Answers:

---

GENUINELY

SINCERELY



10 Character Answers:

---

ICANNOTLIE

UPONMYWORD



11 Character Answers:

---

BEYONDDOUBT

HONESTTOGOD

INACTUALITY



15 Character Answers:

---

ALLKIDDINGASIDE

ASAMATTEROFFACT

WITHOUTQUESTION