Crossword Genius

Tom, say, fencing off grand and small grain store (9)

Ross

I believe the answer is:

malthouse

'grain store' is the definition.
(building that stores malt)

'tom say fencing off grand and small' is the wordplay.
'tom say' becomes 'male' (tom can mean a male cat).
'fencing off' indicates putting letters inside.
'grand' becomes 'thou' (synonyms).
'and' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'thou'+'s'='thous'
'male' placed around 'thous' is 'MALTHOUSE'.

(Another definition for malthouse that I've seen is " farm building".)

I've seen this clue in The Times.
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