Stole — in addition — a thousand (4)
I believe the answer is:
took
'stole' is the definition.
(I've seen this before)
'in addition a thousand' is the wordplay.
'in addition' becomes 'too' (I've seen this before).
'a thousand' becomes 'k' ('K' can be a synonym of 'thousand'**).
'too'+'k'='TOOK'
(Other definitions for took that I've seen before include "Captured" , "Seized" , "shot" , "Gained; stole; made (notes)" , "Stole - accepted" .)