Centre for computers, say (3)
I believe the answer is:
put
'say' is the definition.
(thesaurus)
'centre for computers' is the wordplay.
'centre for' indicates the central letters.
The central letters of 'computers' are 'PUT'.
(Other definitions for put that I've seen before include "Place; placed" , "Place in a location" , "Set (in place)" , "Place, lay" , "Place in a position" .)