He can give you a toot (4)

I believe the answer is:

otto

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

'he' is the definition.
(I've seen this before)

'give you a toot' is the wordplay.
'toot' anagrams to 'OTTO'.
But, I am not clear how this is indicated.

'can' is the link.

Can you help me to learn more?

(Other definitions for otto that I've seen before include "he goes" , "Rose produces this" , "Essential oil from flowers - German boy's name" , "perfume ingredient" , "-- Klemperer, conductor" .)

I've seen this clue in the Evening Standard.

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