Three.
Astericked clue has two answers. Same length.
13d. * Shots usually travelling to th right, except a number going near the middle (6, Three letters same)
I have SHI??A and THI?KS
24. * came around, all thinking the same (5, three letters same)
I have AWOKE for Came round and ATO??
31 * sort diesel engine's casing gone wrong (4, two letters same)
I have KIND for sort and S?LD DL from diesel and ES from engine's making SELD?