A male deep-toned with a robe suitable for diplomat (12)

I believe the answer is:

ambassadress

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

'suitable for diplomat' is the definition.
'ambassadress' can be an answer for 'diplomat' (ambassadress is a kind of diplomat). I'm unsure of the 'suitable for' bit.

'a male deep-toned with a robe' is the wordplay.
'a male' becomes 'am' (I've seen this in other clues**).
'deep-toned' becomes 'bass' (I've seen this before).
'with' says to put letters next to each other.
'robe' becomes 'dress' (I've seen this before).
'am'+'bass'+'a'+'dress'='AMBASSADRESS'

Can you help me to learn more?

(Other definitions for ambassadress that I've seen before include "Diplomat" , "One must be diplomatic" .)

I've seen this clue in The Telegraph.

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