"We need to play better cricket," Clarke said.
"We need to sit down as a team and have a look at our performances over the last 12 months and areas we need to get better.
"It certainly wasn't preparation. I thought our training was outstanding and we played some really good cricket in the couple of warm-up games but we have no excuses.
"A lot of credit needs to go to England. They've outplayed us in all four matches, they've been very consistent, their bowlers have bowled with good patience and discipline and their batters have made runs.
"We haven't done both. We didn't have anybody make a big score as a batter, we lost a lot of early wickets throughout the series and we didn't execute our skills as well as you need to.
"It's been good to have a look at guys, no doubt," Clarke added. "It's good to give them a taste of international cricket.
"Any chance you get to play for Australia in one-day cricket you're pushing for test selection, I guess."