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All answers having "Strain" as clue:

3 Character Answers:

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AIR

TAX

TRY



4 Character Answers:

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ACHE

ONUS

PULL

SIFT

SONG

TOIL

TUNE



5 Character Answers:

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BREED

EXERT

SIEVE



6 Character Answers:

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FILTER

MELODY

OVERDO

RAIDER

STRESS

TAUTEN



7 Character Answers:

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OVERTAX

TENSION



8 Character Answers:

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EXERTION

FILTRATE



9 Character Answers:

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OVEREXERT