Removing eggs e.g. nits spread after November (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Anagram (spread) of EG NITS after N . Not sure I quite understand how the definition here relates to the solution – I know some birds sometimes remove eggs from their own nests to optimise the size of the clutch, but that doesn’t seem to me to be the correct interpretation here. Any better ideas welcome – see PostMark@1