Crossword Genius

Seems a girl regularly used communication system (5)

Ross

I believe the answer is:

email

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

'communication system' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'seems a girl regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'seems'+'a'+'girl'='seemsagirl'
The alternate letters of 'seemsagirl' are 'EMAIL'.

'used' is the link.

Can you help me to learn more?

(Other definitions for email that I've seen before include "Messages via the internet" , "Send one online" , "Internet-borne communication" , "Messages between computer terminals" , "Electronic communication" .)

I've seen this clue in The Times.
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