I don't think it's a difficult question.
In order to surf, the rider has to have certain techniques engrained to be able to stay on the board and ride the wave back in.
WCK has certain techniques to address fighting. In this case the area of fighting is clinching. If WCK has certain tactics used specifically for clinching...what are they?
For example, in my past reply in this thread, I mentioned a technique used in MT to transition from being in the dominant clinch to using the dominant clinch:
Using a wedge to come forward, that's also used as a tactic in Muay Thai and shouldn't be alien to wc folk either (because in one of the tactics you're basically using a pak/gam to the inside elbow while you biu over your hand into the created space into man geng sao).
It provides more detail than saying "all of it is used for the clinch" and specifically addresses the OP's question in a wing chun context.