Crossword Genius

Space in which to moor? (4)

Ross

I believe the answer is:

room

I'm a little stuck... Click here to teach me more about this clue!

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

'which to moor?' is the wordplay.
'moor' anagrams to 'ROOM'.
However, I'm unsure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for room that I've seen before include "Space (for elbows?)" , "basic accommodation" , "Enclosed indoor space" , "Scope; living space" , "Chamber; scope" .)

I've seen this clue in the Evening Standard.
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