Girl feels lie-in regularly needed (5)

I believe the answer is:

ellen

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'girl' is the definition.

'feels lie-in regularly needed' is the wordplay.
'feels' becomes 'el' (I can't explain this - if you can you should give a lot more credence to this answer).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'needed' is a charade indicator (letters next to each other).
'lie'+'in'='liein'
The alternate letters of 'liein' are 'len'.
'el'+'len'='ELLEN'

Can you help me to learn more?

(Other definitions for ellen that I've seen before include "Dame - MacArthur, round-the-world sailor" , "- Terry, Eng. actress" , "the Lady of the Lake" , "Girl" , "Dame - Terry, English actress" .)

I've seen this clue in The Sun.

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