What is referred to by 'a lepidopterist'?

What is referred to by 'a lemony guy'? Based on the clue 'a length of hair added to your own or 3 letters su...', what is the answer? What is referred to by 'a lengthy meandering boulevard'? Based on the clue 'a leopard is the baby in the title of this screwba...', what is the answer? Based on the clue 'a leptocephalus or larval moray eats drifts for m...', what is the answer? Based on the clue 'a lerner loewe musical about a lovely insect who ...', what is the answer? Based on the clue 'a lerner lowe song lyric goes thank heaven for th...', what is the answer? What is referred to by 'a leslie nielsen comedy'?