Hi Bagheera33,
15d Mollusc crushed husks swallowed by folk hero (4,5)
Anagram/crushed of "husks" in a "folk hero" (first name 'william')
27a Numbers of Germans were dishonest on retreats (6)
Definition is "numbers of Germans" (German name for songs) - 4 letter word meaning "were dishonest" + 2 letters for "on" reversed/retreats.