INSTRUCTOR PLT DURING INST TRAINING FLT FAILED TO RECOGNIZE THAT HIS TRAINEE DID NOT HAVE TAXI CLRNC TO RWY FOR TKOF AFTER GETTING INST FLC CLRNC.

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I HAD AN INCIDENT AT CRG ARPT WHICH I THINK HAS A HIGH PROBABILITY OF OCCURRING AT OTHER ARPTS AND I THINK THIS SIT NEEDS ADDRESSING. I AM A FLT INSTRUCTOR AND WAS CONDUCTING AN INST TRAINING FLT. MY STUDENT CALLED THE TWR AND ANNOUNCED THAT WE WERE IFR TO TALLAHASSEE REGIONAL. HE WAS GIVEN THE IFR CLRNC AND COMMENCED TO TAXI TO THE ACTIVE RWY. AFTER WE COMPLETED OUR RUN-UP; WE ASKED FOR PERMISSION TO TAKE OFF. WE WERE GIVEN THE TKOF CLRNC. WE WERE INFORMED AFTER WE TOOK OFF THAT WE HAD NOT OBTAINED A TAXI CLRNC. MY STUDENT RESPONDED THAT HE THOUGHT WE HAD BEEN CLRED. THE TWR RESPONDED THAT THEY NEVER ISSUED A TAXI CLRNC. I THINK THAT THIS IS A MISTAKE THAT COULD EASILY BE MADE BY NEW INST PLTS. NOW; I AS THE INSTRUCTOR SHOULD HAVE CAUGHT THIS MISTAKE BUT DID NOT. I LET MYSELF BE DISTR WHILE I WAS PROGRAMMING A GPS. HOWEVER; I STARTED THINKING ABOUT THIS AND HOW CONFUSING THIS COULD BE TO A LOW TIME INST PLT (RECEIVING AN IFR CLRNC AND INTERPING THAT AS ALSO A TAXI CLRNC). MOST OF THE TIME THE TWR WILL GIVE THE CLRNC AND THEN ASK IF YOU'RE READY TO TAXI. THAT IS NOT WHAT HAPPENED IN THIS CASE. THE OTHER SCENARIO IS WHEN YOU CALL CLRNC DELIVERY FOR YOUR CLRNC THEY WILL ALWAYS TELL YOU TO CONTACT GND CTL FOR YOUR TAXI CLRNC AND THIS IS ALWAYS CLR. I THINK PERHAPS THAT THE TWRS SHOULD ADOPT A STANDARD POLICY THAT WHEN THEY ISSUE AN IFR CLRNC THAT THEY SHOULD ALSO ASK IF YOU'RE READY TO TAXI OR SAY CALL US WHEN YOU'RE READY TO TAXI. THIS WOULD BE A LOT MORE CLEARER.