Crossword Genius

Building old and as you see unfinished (9)

Ross

I believe the answer is:

oasthouse

'building' is the definition.
(oasthouse is a type of building)

'old and as you see unfinished' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'and' is a charade indicator (letters next to each other).
'you' becomes 'thou' (historical second person pronoun).
'unfinished' means to remove the last letter.
'see' with its last letter taken away is 'se'.
'o'+'as'+'thou'+'se'='OASTHOUSE'

I've seen this clue in The Times.
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