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11 Across, Most stupid in Hollywood at any rate (9)

12 Across, Underfed vagrant returned (8)

28 Across, Christian keeps quiet about American's shame (8)

5 Down, Ball (short) put into box (8)

No letters

Many thanks

12 refunded (anagram underfed)

28 dishonour (american spelling )
christian - Dior
quiet - sh
about - on

Oops - dishonor

11 leastwise (American usage)

Many thanks jazzgirl.

Maybe 5 is testicle - whoops
If so, cannot parse

5d testicle

short put - stic(k)
in
box - Tele (TV)

Well done jazzgirl! But if it's taken a solver like you that long to parse the clue with the answer in front of you, it tells me that it's a poor clue.