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All answers having "4" as clue:

3 Character Answers:

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APR

AVG

GHI

PAR

PIE

ZIP



4 Character Answers:

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ACRE

AREA

HSIA

IIII

LOOT

LORD

NILE

TONS



5 Character Answers:

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APRIL

RADAR

SQYDS



6 Character Answers:

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MMMMCI



7 Character Answers:

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INTEGER

ONEACRE

TWOTONS



8 Character Answers:

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KILOTONS



9 Character Answers:

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DISCOVERY



10 Character Answers:

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SQUAREROOT



11 Character Answers:

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GEOMTRICMAN

TWOTIMESTWO



13 Character Answers:

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PERFECTSQUARE



14 Character Answers:

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TWITTERHASHTAG



15 Character Answers:

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SEVENMINUSTHREE

TWENTYOVERFIVEX

WHATCHAMACALLIT



17 Character Answers:

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BEHINDTHEFOURBALL