Crossword Genius

Impractical advice for someone trying to economise (7)

Ross

I believe the answer is:

useless

'impractical' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for useless that I've seen before include "Of no practical or worthwhile application" , "idle" , "Of no practical application, not worth keeping" , "Poor" , "Is Sue less impractical?" .)

I've seen this clue in The Guardian.
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