First mouthful of cappuccino: fine start to one's morning (4)

I believe the answer is:

foam

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'first mouthful of cappuccino' is the definition.
I can't judge whether this defines the answer.

'fine start to one's morning' is the wordplay.
'fine' becomes 'f' (abbreviation in pencil classifications).
'start to' suggests taking the first letters.
'morning' becomes 'am' (as in 12:00 AM).
The initial letter of 'ones' is 'o'.
'f'+'o'+'am'='FOAM'

Can you help me to learn more?

(Other definitions for foam that I've seen before include "Sea froth" , "Froth or spume" , "Froth, bubbles" , "Suspension of gas in a liquid" , "At the mouth, this may mean madness or extreme anger" .)

I've seen this clue in The Independent.

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