Support, in a manner of speaking, for sanest boss (6)

I believe the answer is:

assent

I'm a little stuck... Click here to teach me more about this clue!

'support' is the definition.
(thesaurus)

'a manner of speaking for sanest boss' is the wordplay.
'sanest' can be anagrammed to 'ASSENT'.
Though, I'm not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for assent that I've seen before include "Agreement (to a proposal)" , "Say yes" , "Expression of agreement" , "Accede, acquiesce" , "Permit or approve" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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