Wellington's nickname (4,4)

I believe the answer is:

iron duke

'wellington's nickname' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for iron duke that I've seen before include "Wellington's nickname" , "leader of old" , "Metallic nickname for Waterloo's Wellington" , "Former PM" , "Wellington's byname" .)

I've seen this clue in the Irish Times (Simplex), The Guardian and The Times.

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