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2 Down, WWll battle closed bridge supported by allied country (6)
?O?R??

16 Down, My son's unusually quiet - it's something inexpressible (8)
M?S???U? MYSTIQUE?

17 Down, Hacker possibly picked up regrets about semi-automatic program (8) S???T?U? SABOTEUR?

Compiler - PHI

Many Thanks

17 RUES - regrets upwards around BOT - semi-autonomous program

16 MY S(on) and anagram QUIET

2, Tobruk

2d To - closed
BR - bridge
UK - allied country

Tobruk - WWII battle

Many thanks to all.