13a: Become engaged. 6 letters. e???s? Could it be enmesh??
23a: Could be seeing red before Sunday as a result of the overeating. 10 letters. ?r?e?i?e?s
2d: Enterpreneur’s drive to work. 2 words 6/6. P???o? and ??t?v? . I think second word might be motive
8a: In favour of short concert being curtailed. 3 letters. p??
Thanks very much to all. One final clue:
10a: Getvthis mollusc out with difficulty. 6 letters. ???k?e. I thought maybe cockle but that wouldn’t work with the word profit. Could it be pickle??