The Question and Answer section for The Collector is a great resource to ask questions, find answers, and discuss the novel.
Initially Frederick likes to collect butterflies but he eventually begins to kidnap beautiful women and "collect" or rather imprison them.
This question sounds like you've been studying sonnet and the poets who wrote them. I can choose three sonnets that I personally place at the top of the list..... but I have a feeling you've been working with a text that contains your teacher's...
Frederick Clegg is the collector.