ACROSS
 1 and 5 Where he sits to form his opinions might be easy, as well. (8,6)
10 A man no youngster has to bother, obviously. (5)
11 You’ll have to fight to press for the business some dealers are in. (5,4)
12 Going for the title, perhaps? (7)
13 Put into operation at acute trouble. (7)
14 Straightforward conduct. (6)
15 Some signals might be called after them. (7)
18 If the pigskin gets dirty, do they use this, or would that be nonsense? (7)
21 Reputedly happy spirit brought forth by one? (6)
24 Where to find the point of etching to be à la mode. (2,5)
26 Led back with the sort of dude that’s easily tricked. (7)
27 Changes the title, perhaps. (9)
28  See 7 down
29 The part of the skimobile that’s used to travel on snow. (6)
30 Lies cold when taken apart, but ultimately comes together. (8)
 
DOWN
 1 and 17 Her character emphasized the little grey cells. (6,8)
 2 and 25 You might find one in a Chinese restaurant, though you might not want to meet one sailing. (3-6,5)
 3 The diary he composed might typify somewhat dated entertainment. (7)
 4 Such things can be seen to prove understanding. (7)
 6 Said to be placed in the woodwind, perhaps. (7)
 7 and 28 across You’re on solid ground here. (5,5)
 8 Possibly a plier as it once appeared. (8)
 9 Henry V suggested going into it once more. (6)
16 With the umbrella, under Edwardian rules it should show what could be cleaned up. (9)
17 See 1 down
19 Flower arranging lays the total amount. (7)
20 Observed he precedes a misdeed? (6)
21 A rather retiring circle in California? (7)
22 The train was in Patience. (7)
23 Jane of Hull House. (6)
25 See 2