Hi FeeBee,
22a - 4 letter "clean" minus its last letter/'mostly' _ 4 letter "quarterdeck" which you need to split in two, so 'quarter (of a) deck' - definition is "hobby" and it begins with a P.
22d - Double definition.
24a - Straight anagram - definition is "a by-product of hard labour".
10a - 7 letter "one inspects pupils" minus its last 2 letters/'losing way' with "way" an abbreviation - definition is "round window"