Actually, the Clarity is not
Actually, the Clarity is not Civic-sized. It's longer than an Accord by less than an inch. This is the most comfortable car I've ever owned. Last weekend we drove 640 miles and achieved 49.6 mpg in Hybrid Vehicle mode with no EV travel to skew the numbers.
The reason there are many more Clarity PHEVs than BEVs is because the PHEVs are available in all 50 states and Canada but the BEVs are leased only in California and Oregon and they're not always available, unlike the PHEVs. The lease deal on the Clarity BEV is very nice, which makes the 89-mile range easier to accept if you have another vehicle for long-haul purposes.
Finally, the Clarity's 17 kWh battery wouldn't fit into the current CR-V. The larger Pilot has more room and will soon appear as a Plug-In Hybrid. It will be interesting to see if Honda prices the Pilot PHEV as aggressively as the Clarity PHEV.