The Telegraph Toughie Crossword

What could transport adept dealers round Mississippi primarily?

PADDLESTEAMER ...

Watered-down like some cheap beer served round hotel

THINNED ...

Very slender support for striker

MATCHSTICK ...

They may learn to operate as groups of three

INTERNS ...

The power of mathematics

EXPONENT ...

Temporary feature of football

PASSING ...

Staunch scientific subjects

STEM ...

Scenery that should not change over centuries

STAGESET ...

Researcher has job over in Washington

POSTDOC ...

Recording established in Slough base

CASSETTE ...

Provides backing musicians but no leader

ASSISTS ...

Predecessor of SI encapsulated by metres and things like that

METRIC ...

Players run out in famous red

CASTRO ...

Overwhelming force gripping North America, I have to retreat

TSUNAMI ...

Old record store certain others dubiously exploit

SOMERSETHOUSE ...

Massive build-up of earthy peat

HYPE ...

Maker of razor with unknown alloy

OCCAMY ...

Island venue for Bill ‘Aley fans?

ROCKALL ...

In tennis, unsuccessfully hit Henman’s returns, losing to love!

SMITTEN ...

I’d return rolls to get butter in

INTRUDER ...