Two interlocking* clues,and one other.
11ac)Our proprietor's second best,or crooked. (7)
S-*---S
(2d)Ejaculation prompted by cold,second-rate mainstays of education. (4)
-R-*
Other clue;
(29ac) Pisspoor material from rather formal Motown artist.(5)
M-O-S
Strobes and brrr Strobes is sometimes called the editor of private eye and B is second rate and the three R's is the mainstays of education. So we say BRRR when it is cold. It took me ages to figure that out lol