NS are playing Standard American where 1♣ shows 3+ clubs. Assume EW are also playing basically standard.
The call in question is West's 2♣.
(1) Absent any specific discussion, what should 2♣ show?
(1a) Is this similar to what 2♦ would have shown on the same sequence?
(2) What would 1NT, Dbl, or 2NT show in this sequence (instead of 2♣)? Again assume generally standard methods with no specific discussion.
(3) Playing your choice of methods with your favorite partner, what does 2♣ show for you?
(4) How would this be different if West were dealer (so South was unpassed)? If North were dealer (so West was unpassed)?