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20d.6lets. D-e-e--.Exercise in river and street is hardest to understand.
21d.6lets.-l-t-r.Strange result in 11's home ground.
29a.7lets. D-n-i--.Some correspondentis taping part of the medical team.

20d DEE PE ST

(that's assuming 7 letters as indicated by the hyphens...)

21d ULSTER

29a DENTIST (hidden in clue)

Thanks Paul.