Hobby's starting point, oddly (13)

I believe the answer is:

train-spotting

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(Other definitions for train-spotting that I've seen before include "Railway hobby; UK film; five Dn (anag.)" , "Concern with railways (or trivia?)" , "Film about drug addicts (or railway buffs?)" , "1996 film based on a novel by Irvine Welsh" .)

I've seen this clue in The Telegraph.

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