Last pieces of Henry Moore and Barbara Hepworth? Sure! (4)
I believe the answer is:
yeah
'sure' is the definition.
(I've seen this in another clue)
'last pieces of henry moore and barbara hepworth?' is the wordplay.
'last pieces of' says to take the final letters (I've seen 'last piece of' mean this).
'and' means one lot of letters go next to another.
'barbara hepworth?' becomes 'ah' (I can't explain this - if you can you should believe this answer much more).
The final letters of 'henry moore' are 'ye'.
'ye'+'ah'='YEAH'
Can you help me to learn more?
(Other definitions for yeah that I've seen before include "casual agreement" , "Casual form of yes" , "Informal agreement" , "Indeed" , "'She loves you, ..., ..., ...' (song)" .)