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All answers having "Understand?" as clue:

3 Character Answers:

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DIG

ELI

GET

GME

SEE



4 Character Answers:

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DEAR

FEEL

GROK

HEAR

KNOW

READ

TWIG



5 Character Answers:

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GETIT

GETME

GOTIT

GRASP

LEARN



6 Character Answers:

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ACCEPT

FATHOM

YOUSEE



7 Character Answers:

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BUBBLES

CAPEESH

CAPISCE

CATCHON

REALISE

REALIZE



8 Character Answers:

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COTTONON

DOYOUSEE

PERCEIVE



10 Character Answers:

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COMPREHEND

GETMYDRIFT

THEMESSAGE



11 Character Answers:

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SEETHELIGHT



12 Character Answers:

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KNOWHATIMEAN

KNOWTHESCORE



13 Character Answers:

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GETTHEPICTURE



15 Character Answers:

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DOYOUGETMYDRIFT

SEEWHATIMSAYING