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15a , A huge number nearly escape working 6
19a , Gun gets stripped in advance 6
12d , Sixth young lady runs out to get watch 5
16d , Old London theatre tackles plot that is manageable 8

Legion
R evolve R
Vigil
Obedient

12 Vigil, watch. It's VI/six + gi(r)l (taking the 'r'/runs, out of girl).

Thanks chaps !

thanks for all the answers,found this puzzle really difficult. dont understand clue 16 down obedient, what is the old theatre????

O = old
London theatre = NT (National theatre)
Plot = bed
That is = ie
Manageable = definition.

Obedient - bed(plot) + ie(that is) o(old) & NT(National Theatre)