Merciful post-war prime minister, say? (7)

I believe the answer is:

clement

I believe this clue is a double definition.

'merciful' is the first definition.
(associated in meaning)

'post-war prime minister say?' is the second definition.
(PM Clement Attlee is an example)

(Other definitions for clement that I've seen before include "Mild or balmy" , "Mild; gentle; merciful" , "9, the chef and MP" , "mercy" , "opponent for Winston" .)

I've seen this clue in The Times.

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