Clearance with an Odd Intersection

Has anyone received a route clearance that included an intersection that was
only on an approach chart and not in an Enroute Chart?
Flew IFR from FRG to GON with the following clearance: Farmingdale Three,
radar vectors BDR, direct MAD, MAD 126 radial to MONDI, direct.
For the life of me I couldn't find MONDI on the enroute. However, it was in
my (up-to-date) Garmin 430 database and it was pretty much on the way
(albeit a bit of a dogleg) so I didn't make it an issue. Turns out MONDI is
only on the KGON ILS RWY 5 and it's not even an IAF. The GPS RWY 33 was the
active approach which made it even more difficult to figure out.

Is this commom anywhere else? Should they have told me it was only on an
IAP chart? Are all the fixes on any of a given airport's approach charts
fair-game to include in an enroute clearance?

Regards,
Marco Leon