Father always picked from the middle deck (6)

I believe the answer is:

thwack

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'deck' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for thwack that I've seen before include "Hit with something flat" , "Hard-hitting report" , "Wallop" , "Beat with something flat" , "Strike with something flat" .)

I've seen this clue in The Irish Times.

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