Sharpen the review, starting with point (4)
I believe the answer is:
whet
'sharpen' is the definition.
(I know that whet is a more specific form of the action sharpen)
'the review starting with point' is the wordplay.
'review' is an anagram indicator.
'starting with' means one lot of letters go next to another.
'point' becomes 'w' (W is an example).
'the' anagrammed gives 'het'.
'het' after 'w' is 'WHET'.
(Other definitions for whet that I've seen before include "Edge" , "Sharpen - stimulate" , "Sharpen the blade of (a tool/weapon)" , "Stimulate (appetite)" , "Sharpen, appetite or razor" .)