Hillary Clinton denounced Afridi's treatment as "unjust and unwarranted"
Media reported that Shakeel Afridi was convicted of treason under the country's tribal justice system for alleged ties to militants and jailed for 33 years in May 2012, but the authorities set aside the sentence in August on appeal and ordered a retrial.
Lawyers for the doctor challenged the August ruling, made by the commissioner of the northwestern city of Peshawar, in the Federally-Administered Tribal Areas (FATA) Tribunal.
"The tribunal has asked him to remove ambiguities from his order and make a clear decision and send it back to us," tribunal chairman Shah Wali Khan told reporters after issuing the order.
Afridi was arrested after US troops killed Al-Qaeda chief bin Laden in May 2011 in the northwestern town of Abbottabad. Islamabad branded the raid a violation of sovereignty and US relations fell to an all-time low.
He was convicted not for working for the CIA, for which the court said it had no jurisdiction -- but for alleged ties to militants.
Angry lawmakers in the US saw the original sentence as retaliation for the bin Laden raid and threatened to freeze millions of dollars in vital aid to Pakistan.
The then Secretary of State Hillary Clinton denounced Afridi's treatment as "unjust and unwarranted".