Chelsea girl? (4)

I believe the answer is:

else

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

'girl?' is the definition.

'chelsea' is the wordplay.
'ELSE' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for else that I've seen before include "Alternatively" , "Otherwise; different from" , "Eels (anag)" , "Besides; different" , "Adverb meaning if not, otherwise" .)

I've seen this clue in the Evening Standard.

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