Crossword Genius

Fell, turning over in space (4)

Ross

I believe the answer is:

room

'space' is the definition.
(room is a kind of space)

'fell turning over' is the wordplay.
'fell' becomes 'moor' (I've seen this before).
'turning over' is a reversal indicator.
'moor' in reverse letter order is 'ROOM'.

'in' acts as a link.

(Other definitions for room that I've seen before include "Scope; living space" , "Enclosed space in a building" , "Adequate space" , "See 17" , "bedsit?" .)

I've seen this clue in The Times.
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