Exaggeration about gallery employees in centre of Boston (13)

I believe the answer is:

overstatement

'exaggeration' is the definition.
(I know that exaggeration can be written as overstatement)

I can't explain the rest of the clue.

(Other definitions for overstatement that I've seen before include "Hyperbole" , "Exaggeration" .)

I've seen this clue in The Times.

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