Crossword Genius

One forbidden to indulge when in office? (6)

Ross

I believe the answer is:

smoker

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'office?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I don't understand the rest of the clue.

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(Other definitions for smoker that I've seen before include "part of train once" , "one cures" , "User of cigarettes" , "Puffer" , "One who enjoys a cigar?" .)

I've seen this clue in the Evening Standard.
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