Sinclair moves to Baggies on loan
Sinclair moved to Eastlands last August in a £6.2million move from Swansea, but he only made two Barclays Premier League starts and is trying to revive his career at The Hawthorns.
"Scott understands he needs to play football and we're delighted he feels this is the right club for him at this stage of his career," Clarke told the club's official website.
"He's the type of player we were missing from the squad. He's a pure winger who is quick, direct and scores goals - he has proved that over his career.
"He can play off the right or left and improves our attacking options. I know him well and he's a good person who's 100 per cent committed to our cause.
"He's frustrated he didn't get the chances to play at Man City last season and hopefully he'll take those frustrations out on Premier League defenders this season."