But at the Turk's Head, might it not contain water? (4)

I believe the answer is:

butt

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'it not contain water?' is the definition.
The definition suggests a singular noun which matches the answer.

'but at the turk's head' is the wordplay.
'at' means one lot of letters go next to another.
'head' suggests taking the first letters.
The initial letter of 'turk' is 't'.
'but'+'t'='BUTT'

'might' is the link.

Can you help me to learn more?

(Other definitions for butt that I've seen before include "Attack" , "Victim of ridicule" , "End of stock" , "bum..." , "Water-cask; object of derision" .)

I've seen this clue in the Evening Standard.

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