Block some entertaining others (5)
I believe the answer is:
ingot
'block' is the definition.
(ingot is a kind of block)
'some entertaining others' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'INGOT' can be found hidden inside 'entertaining others'.
(Other definitions for ingot that I've seen before include "Block of, eg, gold" , "A lump of metal, perhaps gold" , "Metal casting" , "Unwrought metal cast in a mould" , "expensive block" .)