More black wool tangled in space (5-4)

I believe the answer is:

elbow-room

'space' is the definition.
(elbow room can mean space to move)

'more black wool tangled' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'tangled' indicates anagramming the letters.
'more'+'b'+'wool'='morebwool'
'morebwool' with letters rearranged gives 'ELBOW-ROOM'.

'in' acts as a link.

I've seen this clue in The Independent.

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