Aggressively promote device for plumber or electrician (4)

I believe the answer is:

plug

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'aggressively promote' is the definition.
'plug' can be an answer for 'promote' (plugging is a kind of promoting). I am not certain of the 'aggressively' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plug that I've seen before include "Stuff" , "Stopper - advertisement" , "Stopper - publicise" , "Fitment at the end of a flex" , "Promote" .)

I've seen this clue in The Times.

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