2 silly little ones left and intersecting: 5d - become member of board (5). I have e---r; 10a - film on cross-dressers seen here (2,3). I have -- s-t. Film could be ET or solution could be ON SET (film studio or location) but cannot see how to work cross-dressing into any potential soution. Thanks.
Thanks Mamyalynne - best answer - and others. Must have led sheltered life - had never come across TV as abbreviation for transvestite. The 'become member of board' seems a weak clue to me in an otherwise clever puzzle - Saturday Guardian.