Oas was clawed back during 2017 but amount reported on on T4 A does still shows full amount, will this be reflected on 2017 return?

Did you receive a T4A(OAS)? Does it show taxes paid?

yes received t4 A and yes income  txe was deducted

So the tax deducted is the clawback but you may also see it as an amount due on line 422.