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Kinkier Leo's on hand, revising Len's spy trilogy (4,4,3,6)

Len Deighton wrote "Spy Hook", "Spy Line" and "Spy Sinker". [As well as a "(Berlin) Game, (Mexico) Set and (London) Match" trilogy.]

19 parses as anag of KEIR'S+N?

Pitcher's weapon: adulterated potassium resin (6)

Anag RESIN+K, there's a resin bag on the pitcher's mound.

Titanic? (6)

[Thanks for parsing #19, Geeker]

Knock off husband's glasses. Starts to keen (4)

Keen - cry/sob

Husband picks up glasses for a krona. A knock off?

How a Great White might fall for the bait? (4,4,3,6)

Get together, but don't head north to Spurn Point (4)

Hook (up)

Def. - 'A spit of land with a hooked end'.

Spurn Point is a hooked (recurved) spit in East Yorkshire.

Get together by church at Spurn Point (4)

Hook (up)
Church - up (United Presbyterian).