Clive was a recent addition to the crew of the Jinivere, but his pirate blood had shown through quickly after his hiring. His suggestion to Aerys might have flown on a pirate ship, but this was a merchant vessel. The captain never made it to Sargava, where he would undoubtedly be promptly fired.
Clive is foul-mouthed and moody, yet he has a way of speaking that makes him difficult to ignore. His gruff tone and thick accent suits him well. He curses and celebrates with the same passion, sometimes in the same breath.