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All answers having "Catch sight of" as clue:

3 Character Answers:

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RHO

SEE

SPY



4 Character Answers:

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ESPY

FLEA

NOTE

SPOT



5 Character Answers:

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ASYET

POISE

ROTOR



6 Character Answers:

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ACCESS

ASYLUM

DESCRY

DETECT

NOTICE

THORAX

TSHIRT



7 Character Answers:

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GLIMPSE



8 Character Answers:

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FEBRUARY

INCREASE

PERCEIVE

REALISED



9 Character Answers:

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LAYEYESON

SETEYESON



10 Character Answers:

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CLAPEYESON



11 Character Answers:

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UNDESIRABLE



13 Character Answers:

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GERMANMEASLES

PENNYPINCHING