Pilot Contoller Glossary:

FINAL APPROACH FIX- The fix from which the final approach (IFR) to an airport is executed and which identifies the beginning of the final approach segment. It is designated on Government charts by the Maltese Cross symbol for nonprecision approaches and the lightning bolt symbol for precision approaches; or when ATC directs a lower-than-published glideslope/path intercept altitude, it is the resultant actual point of the glideslope/path intercept.

Notice, the PCG mentions where the FAF is if ATC clears you to intercept the glidepath below the published Glideslope Intercept Altitude. However, it does not mention if they clear you the approach and you are above the published Glideslope Intercept Altitude.

In this case, you *should* fly the approach (using non-precision methods) to comply with published minimum, maximum, or hard altitudes --- the Glideslope may not comply with these restrictions. Additionally, the gideslope at most airfields is only good (and flight checked) to a distance of 10NM. If you intercept the glideslope from a high altitude, you run the risk of intercepting a false glideslope.

-Fatty