Crossword Genius

Smoker's receptacle is one-third off course (6)

Ross

I believe the answer is:

astray

I'm a little stuck... Click here to teach me more about this clue!

'off course' is the definition.
(to be led astray is to be led off course)

'smoker's receptacle is one-third' is the wordplay.
I cannot quite understand how this works, but
'receptacle' could be 'tray' (tray is a kind of receptacle) and 'tray' is located in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for astray that I've seen before include "Off-course" , "Off the correct path" , "Well off course" , "Wandering off the path" , "Adrift - misguided - lost" .)

I've seen this clue in the Sydney Morning Herald.
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