Picked up criticism about setter's latest crossword? (4)
I believe the answer is:
grid
'crossword?' is the definition.
(a crossword grid)
'picked up criticism about setter's latest' is the wordplay.
'picked up' says the letters should be written in reverse.
'criticism' becomes 'dig' (I've seen this before).
'about' means one lot of letters goes inside another.
'latest' indicates one should take the final letters.
The final letter of 'setter' is 'r'.
'dig' going around 'r' is 'dirg'.
'dirg' written backwards gives 'GRID'.
(Other definitions for grid that I've seen before include "What's above these clues" , "frame" , "Line network, pattern" , "Barred framework" , "powerful network" .)