most clues contain an additional word
4 answers are too long for the grid space
4 answers are too short...........
1a Opening often repeated without new game (10, 2 words) ????N?M???
The extra word is "opening" or "often"
10a Fourth satellite unified Earth (7) ????O?E "unified " is the extra
31d Make dull love in the arms of famous footballer (4) ???T