Habit of socially inept person (6)

I believe the answer is:

anorak

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'socially inept person' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for anorak that I've seen before include "Coat - trivia expert?" , "Dull person" , "Jacket for an obsessive?" , "Trivia obsessive" , "Hooded waterproof jacket" .)

I've seen this clue in The Telegraph.

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