Crossword Genius

King's mistress engaged in making battlement (12)

Ross

I believe the answer is:

crenellation

'battlement' is the definition.
('crenellation' can be a synonym of 'battlement')

'king's mistress engaged in making' is the wordplay.
'king's mistress' becomes 'nell'.
'engaged in' means one lot of letters goes inside another.
'making' becomes 'creation' (I've seen this before**).
'nell' inserted into 'creation' is 'CRENELLATION'.

(Another definition for crenellation that I've seen is " Battlement".)

I've seen this clue in The Telegraph.
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