Crossword Genius

At that time, one hotel in ten (4)

Ross

I believe the answer is:

then

'at that time' is the definition.
(at some former time)

'one hotel in ten' is the wordplay.
'one hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' means one lot of letters goes inside another.
'h' inserted into 'ten' is 'THEN'.

(Other definitions for then that I've seen before include "At that time; next" , "Consequently" , "Subsequently - previously" , "soon?" , "Afterwards - as a result" .)

I've seen this clue in the Evening Standard.
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