Crossword Genius

The girl I call for? (5)

Ross

I believe the answer is:

cilla

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

'i call for?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'the girl' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'illa' and 'illa' is found within the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for cilla that I've seen before include "- Black, TV personality and singer" , "Colourful old singer" .)

I've seen this clue in the Evening Standard.
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