Crossword Genius

One small fireplace (6)

Ross

I believe the answer is:

single

'one' is the definition.
(synonyms)

'small fireplace' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fireplace' becomes 'ingle' (I've seen this before).
's'+'ingle'='SINGLE'

(Other definitions for single that I've seen before include "Unaccompanied" , "one > individual" , "Free" , "Still miss" , "Short pop record" .)

I've seen this clue in The Telegraph.
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