Battle against royal household (9)

I believe the answer is:

agincourt

'battle' is the definition.
(Agincourt is an example)

'against royal household' is the wordplay.
'against' becomes 'agin' (dialect form of against).
'royal household' becomes 'court'.
'agin'+'court'='AGINCOURT'

(Other definitions for agincourt that I've seen before include "1415 battle in the Pas-de-Calais" , "English-French battle" , "Henry V's battle" , "Battleground" , "battle site" .)

I've seen this clue in The Sunday Times, The Times and The Guardian.

Want a hint initially instead of a full solution? Install my app