21a ephemeral quality (10) T - A - S - E - C -
31d be entirely familar with (4,6,3) - - - - / - N - I - E / - - -
40d relishing a challenge (11) - - - - - T - - - - -
63a thankless (10) - - E - - - A - L -
60a pushing force (6) - - R - S - 43 across buoyany (8) F - - - - - N -