Rough leather: can it match calfskin, ultimately? (8)
I believe the answer is:
shagreen
'rough leather' is the definition.
(type of leather with a rough surface)
'can it match calfskin ultimately?' is the wordplay.
'can it' becomes 'sh' ('can it' can mean stop talking or be quiet).
'match' becomes 'agree' (agreeing is a kind of matching).
'ultimately?' suggests the final letters (I've seen 'ultimately' mean this).
The final letter of 'calfskin' is 'n'.
'sh'+'agree'+'n'='SHAGREEN'
(Other definitions for shagreen that I've seen before include "Sharkskin - he ranges (anag)" , "Sharkskin used as a decorative material" , "Nags here (anag.)" , "rough skin" , "Coarse leather, often dyed green" .)