Girl nerds regularly avoided (6)
I believe the answer is:
missed
'avoided' is the definition.
(missing is a kind of avoiding)
'girl nerds regularly' is the wordplay.
'girl' becomes 'miss' (term of address for an unmarried woman).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'nerds' are 'ed'.
'miss'+'ed'='MISSED'
(Other definitions for missed that I've seen before include "Failed to hit target" , "Didn't catch" , "Didn't attend" , "failed to see" , "Felt the loss" .)