Analyze grammar (5)
I believe the answer is:
parse
'analyze grammar' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for parse that I've seen before include "do grammatical analysis" , "Resolve (a sentence) into its constituent parts" , "Analyse syntactically" , "Analyse sentence" , "Resolve the structure of a sentence" .)