Holiday Collection N0. 72, Giant Cryptic

hi need some help with these answers

1a Making public announcement of record being beaten (10) d?s???s?n?
6d Top of fifty-one plus a further five hundred (3) l?d
18d Suddenly turn first words into funny verse (6) s???v?
21a Ran into chap leading the elderly (7) ?a?a???
34a Was compelled to head off east (3) ???
47a Lettuce companies (3) ???
29d Club thanks Leo on behalf of army unit (9) ????a????

thanks