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Opening in battlement half of them support? Absolutely (9)

Ross

I believe the answer is:

embrasure

'opening in battlement' is the definition.
(opening in a wall)

'half of them support? absolutely' is the wordplay.
'half of' indicates taking half.
'support?' becomes 'bra' (a support for the breasts).
'absolutely' becomes 'sure'.
'them' with half the letters taken is 'em'.
'em'+'bra'+'sure'='EMBRASURE'

(Another definition for embrasure that I've seen is " Opening in a wall for firing through".)

I've seen this clue in The Times.
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