7 across. Square joins very good partners for game. 8 letters.
9 across. Movie director in audio, principally to cover echoes for regional broadcaster. 6 letters.
10 across. Second to arrive in audition for film. 4 letters.
11 across. Supervisors lost Carphone Warehouse business ultimately. 10 letters.
12 across. One posh schoolboy maybe ignoring Latin and Ancient Greek. 6 letters.
14 across. Enthusiastic about bomb starting attack. 4 letters and 4 letters.
15 across. What’s leading scientific personnel to accept a random number generator is less trustworthy. 7 letters.
17 across. No. 1 for Doris Day after record label advance – one that’s almost divine. 7 letters.
20 across. Switch is originally on lead attached to old radiator. 8 letters.
22 across. Proclaim advice to look at another aspect of paper money – sort of? 6 letters.
23 across. Trap somehow meant to get critical journalist. 7 letters and 3 letters.
24 across. Bearing in mind, oddly, that is filling. 4 letters.
25 across. Plan using diplomacy with jerk in timeshare arrangement. 6 letters.
26 across. Stolen sinks initiating court action? 4 letters and 4 letters.