Failed drug test, inconclusive for tramps (7)

I believe the answer is:

trudges

'tramps' is the definition.
(to trudge is to tramp or plod along)

'failed drug test inconclusive' is the wordplay.
'failed' is an anagram indicator.
'inconclusive' means to remove the last letter.
'drug'+'test'='drugtest'
'drugtest' with its final letter removed is 'drugtes'.
'drugtes' is an anagram of 'TRUDGES'.

'for' acts as a link.

I've seen this clue in The Guardian.

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