Crossword Genius

Advertise an electrical fitting (4)

Ross

I believe the answer is:

plug

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

'advertise' is the definition.
(I know that plug is a more specific form of the action advertise)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for plug that I've seen before include "quid" , "Piece of publicity" , "See 19" , "Wad, of tobacco say" , "Bung -- promotion" .)

I've seen this clue in The Globe and Mail.
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