Boggle at Herbie's entertaining tanned skin (7)
I believe the answer is:
leather
'tanned skin' is the definition.
(I've seen this before)
'boggle at herbie's entertaining' is the wordplay.
'entertaining' indicates the answer is hidden within the clue.
'LEATHER' is hidden within 'boggle at herbies'.
(Other definitions for leather that I've seen before include "calf" , "Treated hide" , "Processed animal skin" , "durable material" , "Material made from animal skin" .)