Across
4a
Good thing, an end of fighting in store? That implies no fundamental shift (4,2,6)
See 1
Exchange notes to begin with and perform differently (4)
13a
It completes 1 and 4 across, together with modification of 11, 15, and 23 (4,4,2,4,5)
Move king to safety, as last resort, inside church (6)
Exiled duke introducing son to appropriate circle (8)
See 10
Child’s plea for attention as superspreader? (4)
Rearrange test or keep exactly as is (4)
For Oscar, say, act in sci-fi movie? Au contraire (9)
Semiaquatic mammal, a mother, back in drink (8)
Produce same thing again, poorly accommodating conclusions of the critic (6)
Nevertheless, like happy families in novel start? (3,3,4)
Colleague unaffected by reversal (4)
More like cardinal? Moving left, just the same (6)
Best or worst of French accomplishment (6)
Down
Strive to see maturity in group of equals? (7)
Perturbed about wartime menace (1-4)
Replace two letters in a speech to become understood? (7)
Other changes, including about bully (6)
Recognizes truce, we hear – that could help to save face (9)
Adjust one aspect of photo or make alterations in general (7)
After wee dram, take seat on island in curtailed ballot? That’s speculative (13)
Judged following suit, totally condemned (9)
Line the writer inserted in stuff is shown up as not very original (7)
Re-enter after revolution of earth (7)
Position of leader no different after overthrow (3,4)
Name of goddess or just vowels in name (6)
Conservative replacing first of those elected (5)
Type letters or click words in the clue