1) Accompany or escort 2) Already watched 3) Assign a meaning to 4) Beheld 5) Called at poker 6) Caught a look at 7) Caught as a flick 8) Caught in the act 9) Caught on camera 10) Caught sight of 11) Checked out 12) Come together 13) Comprehended 14) Conceive of 15) Date regularly 16) Dated 17) Deem to be Found on https://www.crosswordclues.com/clue/seen
Seen adjective Versed; skilled; accomplished. [ Obsolete] « Well seen in every science that mote be.» Spenser. « Noble Boyle, not less in nature seen , Than his great brother read in states and men.» Dryden. Found on http://www.encyclo.co.uk/webster/S/54