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All answers having "Express" as clue:

3 Character Answers:

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AIR

BID

PUT

RHO

SAY



4 Character Answers:

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AVER

EMIT

FAST

PONY

SIGH

VENT



5 Character Answers:

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ACELA

OPINE

STATE

TRAIN

UTTER

VOICE



6 Character Answers:

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ASSERT

CONVEY

DENOTE

EVINCE

ORIENT

PHRASE

SPEEDY

STATED



7 Character Answers:

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ECLIPSE

NONSTOP