Slightly out of touch, can someone assist please : 12 across ~ Three months' surplus for weighing device(6,7) 16 Across ~ Big teenager grabs protection at seaside town (5,8) 3 Down ~ Overtly damaged dinghy tailboard (2,5,8) 4 Down ~ Garment crackled, so sit differently (8,5) & 9 Down ~ A rollicking for uncontrolled laughing on set (6,7)......