Girl left Texan behind? (4)

I believe the answer is:

lass

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'girl' is the definition.
(lass can informally mean a girl)

'left texan behind?' is the wordplay.
'left' becomes 'l' (common abbreviation).
'texan behind?' becomes 'ass' (both can mean one's back side. I am not sure about the 'texan' bit.).
'l'+'ass'='LASS'

Can you help me to learn more?

(Other definitions for lass that I've seen before include "Young woman (-. Eng.)" , "Sweet resident of Richmond Hill?" , "Young woman, girl" , "Sweetheart" , "Girl (of Richmond Hill?)" .)

I've seen this clue in The Sun.

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