In trip, gas fails, so having weary walk (9)

I believe the answer is:

traipsing

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'having weary walk' is the definition.
I can't tell whether this definition defines the answer.

'in trip gas fails' is the wordplay.
'fails' indicates anagramming the letters (a failed spelling).
'in'+'trip'+'gas'='intripgas'
'intripgas' anagrammed gives 'TRAIPSING'.

'so' is the link.

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I've seen this clue in The Times.

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