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32d Italian's gracious, introducing learner for a male biology class (8)

MAMMALIA (substitute L for M in Mamma Mia)

Hadj. (Pilgrimage to Mecca.)

Thank you both, that's a great help.

4d Dull disc covers make no money in part of S America (5,6)
M?T?O ?R?S??

5d Poor visibility prolonged his round the world trip (4)
F?G? fogs?

22d Commandeers estate? They give access to flat there (8)
?A???C?S

29a Promise press: thumb or racket? (3,8)
??M ?O???R?W

That's my lot but try as I might I'm stuck on these so any help appreciated.

4. Matto Grosso (place in S.A)

5. Fogg - Philieas Fogg - around the world in 80 days fame

29 Jam tomorrow

Many thanks chrisg. Your 'jam tomorrow' has given me a J in
22 down Commandeers estate? They give access to flat there (8)
?A?J?C?S

Could it be 'carjacks'? But I can't see why!

Why are you attempting this crossword Marnie? It's obviously beyond you.

Marnie
Ignore EdwardBear.
An estate is a type of car, carjack (a bit like hijack) is to illegally take control of a vehicle.
Also you use a carjack when you change a flat tyre.