Meet head of software and computer science (3)
I believe the answer is:
sit
'meet' is the definition.
(I know that sit is a kind of convene)
'head of software and computer science' is the wordplay.
'head of' suggests taking the first letters.
'and' is a charade indicator (letters next to each other).
'computer science' becomes 'it' (I've seen this in other clues).
The first letter of 'software' is 's'.
's'+'it'='SIT'
(Other definitions for sit that I've seen before include "Model" , "I sell badly the cotton yarn" , "Use a chair" , "Brood" , "Take a chair" .)