Country and western singalong girl (3)

I believe the answer is:

gal

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

'girl' is the definition.
(I know that gal is a type of girl)

'country and western singalong' is the wordplay.
'GAL' is hidden in amongst the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for gal that I've seen before include "miss" , "measure of acceleration?" , "Lass" , "US female" , "Girl from American west" .)

I've seen this clue in the Evening Standard.

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