He made a conquest (6)

I believe the answer is:

norman

I believe this is a double definition.

'he' is the first definition.

'a conquest' is the second definition.
(Norman Conquest is an example)

'made' is the link.

(Other definitions for norman that I've seen before include "Old invader" , "15 [JANE] the clothing company" , "Like William the Conqueror?" , "Style of architecture" , "Ten sixty six invader" .)

I've seen this clue in the Evening Standard.

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