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13a. Distracting opponents playing in the snow
SLEDGING.

Understand the answer but not the parse.

21a Points to a reduction in gravity
ACUTENESS

Parse?

Sledging is a tactic, not a nice one, in cricket -to seek to upset the batsman's concentration. It's in Chambers.
. That's the 'distracting opponents', Sledging is also 'playing in the snow'.

24a. Medical device makes king's heart stronger
INHALER

Parse, anyone?

In, the middle letters, heart, of 'king' +haler, stronger.

24 k(in)g's heart + haler

24a.....never heard of HALER before. Thanks

more hale (as in "hale and hearty") would be HALER

21 A CUT (a reduction) followed by cardinal points ENESS. With gravity referring to the differences in grave and acute accents perhaps?

Thanks for the remaining answers. I'd never heard of SLEDGING the dodgy cricket term before. Thanks