Hello - first post, so apologies in advance if I use the wrong jargon!
52a singular = s + a fruit + to make money
definer = fresh flavour
48d people distinct from us + e (ultimate of 'provide') definer = basis for variations
49d Poet Sylvia Plath was separated from whom? - ie she once had 'a XXX' (name), but then she had '??-XXX. (It's a bit weak, to be honest!)