Interpreting bidding by partners
Definitely a reverse, say 15-16+ HCP + distributional values.
Promises 5+ clubs.
Can be a "waiting reverse" with only 3 diamonds to elicit more information from partner, with either 3 hearts or 6+ clubs.


The point to a "waiting reverse" is when opener has multiple options for a non-ideal bid, and wishes to set the denomination after responder rebids. It should be done only in a suit below 2 of responder's suit, unless opener is stronger than a minimum reverse. As noted it is often done with 3 of responder's suit to see if responder can rebid it. It often implies slam interest, as the extra information communicated may be of more use to the defence in merely a game contract.

With a minimum reverse, opener must be able to retreat to either 3 of responder's suit or 3NT if the reverse suit is raised.