Reveal: If you put the letter A in front of several across words, you get new words that could be answers to some down clues. 10A becomes AMAZE, which could be the answer for the 31D clue. 18A = AVOID (2D), 19A = AMEND (57D), 27A = AGENT (7D), 50A = ACUTE (64D), 65A = ABODE (41D), 66A = AVAIL (45D), 71A = AMASS (1D). If you put the down words in numerical order, the first letters spell PEP SQUAD.