Texan's behind in a ship? (3)

I believe the answer is:

ass

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'texan's behind' is the definition.
'ass' can be an answer for 'behind' (both can mean one's back side). I am not sure about the 'texan's' bit.

'a ship?' is the wordplay.
'ship?' becomes 'SS' (prefix in ship names eg SS Great Britain).
'a'+'ss'='ASS'

'in' is the link.

Can you help me to learn more?

(Other definitions for ass that I've seen before include "Charlie" , "'The law is a - - - a idiot' (Mr Bumble)" , "Trump's behind" , "Braying creature" , "transporter" .)

I've seen this clue in The Sun.

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