I can give an example from last night. I was leaving an event (see my journal), and got to chatting with the event organizer outside the venue... I said something like, this is your business you are promoting tonight, she said yes, and I continued "also your husband?" ... subtly checking if she's single, well she isn't married though I gathered her bf may be around somewhere, unless she was joking. So I congratulated her on what a great event it was and how her potential customers could really get into the mood and see what they were signing up for, she agreed "it is great to have people come along and get some ideas"... I gave her intense eye contact and touched her shoulder "you are certainly giving me ideas"... later she said something like, the event was bigger last year but it was on a Saturday, this time we couldn't get a date"... same touch routine, I replied "I think you could get a date anytime". This is called sexual and chase framing. Does that get you thinking? These techniques easily transfer to club situation. She's on her phone -> you open "texting your boyfriend again"...
Ray
Note: There are many other ways to show intent. Get an FR up showing you getting comfortable with above techniques and I will give you some more, such as blockers, sexual vibe.