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3 Down, Shares a colour with ties (7) M?T???S

5 Down, Heroine,without companions, accepting wild weather after heading off (5,5) L???A ?O??? (Lorna Doone?)

16 Down, Line on map free to one to probe statistical quantities (9)
M????????

18 Across, Body clock disturbed by din associated with charity match (9,6) NO LETTERS

Many thanks

16 Meridians, lines on map. Rid, free, means, statistical quantities and I/one.

18 Circadian Rhythm, body clock. (I think it's an anagram but I haven't checked.)

3 Matches - it has both meanings, shares a colour with and (football, for example) ties.

5 (A)lone around (t)ornado

Many thanks to you both.

You're welcome.