Lastly, latte? Skinny or black? (5)
I believe the answer is:
ebony
'black?' is the definition.
('ebony' can be similar in meaning to 'black')
'lastly latte? skinny' is the wordplay.
'lastly' suggests the final letters.
'skinny' becomes 'bony' (I've seen this in another clue).
The last letter of 'latte' is 'e'.
'e'+'bony'='EBONY'
'or' acts as a link.
(Other definitions for ebony that I've seen before include "hard stuff" , "Tree with blackish wood" , "Black hardwood" , "Dark hardwood" , "Hard dark-coloured wood" .)