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All answers having "Understood" as clue:

3 Character Answers:

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DUG

GOT

RHO

SAW



4 Character Answers:

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AHSO

IDIG

ISEE

KNEW

OHOK

READ

SEEN



5 Character Answers:

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CHECK

CLEAR

GOTIT

IMHIP

KNOWN

NOTED

ROGER

TACIT



6 Character Answers:

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AYESIR

GOTTEN

IGETIT

SENSED



7 Character Answers:

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GRASPED

IGOTCHA

IGOTYOU

IHEARYA

LEARNED

MADEOUT

TAKENIN

TENFOUR

YESISEE



8 Character Answers:

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AHGOTCHA

FOLLOWED

IREADYOU

SEENINTO



9 Character Answers:

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ROGERTHAT

SAYNOMORE



10 Character Answers:

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POINTTAKEN



11 Character Answers:

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APPREHENDED

SAWTHELIGHT



12 Character Answers:

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COMPREHENDED