She'll be back in a flash!

I believe the answer is:

sal

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

'she'll' is the definition.
I can't tell whether this definition defines the answer.

'back in a flash' is the wordplay.
'back' is a reversal indicator.
'in' indicates the answer is hidden within the clue.
'las' is hidden in the letters of 'flash'.
'las' written backwards gives 'SAL'.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for sal that I've seen before include "- - volatile" , "girl?" , "Sarah (dim.)" .)

I've seen this clue in the Evening Standard.

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