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All answers having "Observed" as clue:

3 Character Answers:

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RHO

SAW

TAW



4 Character Answers:

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EYED

KEPT

SAID

SEEN



5 Character Answers:

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NOTED

SPIED



6 Character Answers:

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BEHELD

HEEDED

OBEYED

SPRING



7 Character Answers:

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CHIANTI

NOTICED

WATCHED



8 Character Answers:

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INSTANCE

LOOKEDAT

LOOKEDON

REGARDED

REMARKED



9 Character Answers:

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RESPECTED

STOODOVER

WITNESSED