I have not received TDS certificate from the deductor. Can I claim TDS in my Income-tax return?

​​​Yes, the tax credit in such case will be reflected in Form 26AS and, hence, you can check Form 26AS and claim the credit of the tax accordingly. However, the claim of TDS to be made in your return of income should be strict as per the TDS credit being reflected in Form 26AS. If there is any discrepancy in the tax actually deducted and the tax credit being reflected in Form 26AS then you should intimate the same to the deductor and should reconcile the difference. The credit granted by the Income-tax Department will be as per Form 26AS.