Trip (not the second trip) (6)

I believe the answer is:

tumble

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This clue might be a double definition.

'trip not' is the first definition.
'tumble' can be an answer for 'trip' (thesaurus). I'm not sure about the 'not' bit.

'the second trip' is the second definition.
'tumble' can be an answer for 'trip' (tumble is a kind of trip). I'm unsure of the 'the second' bit.

Can you help me to learn more?

(Other definitions for tumble that I've seen before include "Fall, roll, twist" , "Fall helplessly or headlong" , "(and 10) It may be used after 12 18" , "Fall awkwardly" , "Suddenly fall" .)

I've seen this clue in The Independent.

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