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can anyone help me with these cryptic clues please ?

1. Mature marine oyster ? (6) S?????

2. Traitor arrested by that upwardly - mobile legal official (6) ???a??

3. A collection of birds one's taken through railway (6) A?????

3 Aviary

A Via RY

i have another letter for clue 2

2. Traitor arrested by that upwardly - mobile legal official (6) ???a?y

2, No tar y,

i have another letter for clue 1
1. Mature marine oyster ? (6) S????n

1, Sea son?

thanks to everyone who helped me with the answers