Possible Clues:

• Hunger unduly to comprehend item of grammar
• Verb form used as a noun
• Breaking or entering, say
• End of mourning under review, as exemplified in this clue?
• Part of speech in German (and still in German)
• “-ing” word
• Verb form that acts as a noun
• Coming or going?
• A noun formed from a verb, ending with -ing in English
• Noun formed from a verb — nudger (anag)