Pens, say, recreated a connection in the mind (7)
I believe the answer is:
synapse
'a connection in the mind' is the definition.
(synapses relay nerve impulses)
'pens say recreated' is the wordplay.
'recreated' indicates an anagram.
'pens'+'say'='penssay'
'penssay' anagrammed gives 'SYNAPSE'.
(Other definitions for synapse that I've seen before include "Connection between nerve cells" , "signalling junction" , "Nerve cell connector" , "Gap between nerve cells across which signals pass" , "Where two nerve cells meet" .)