Restless type of female the writer would understand (6)
I believe the answer is:
fidget
'restless type' is the definition.
'female the writer would understand' is the wordplay.
'female' becomes 'f' (common abbreviation).
'the writer would' becomes 'Id' ('I would', referring to the crossword setter).
'understand' becomes 'get' (getting is a kind of understanding).
'f'+'id'+'get'='FIDGET'
'of' acts as a link.
(Other definitions for fidget that I've seen before include "Restless person" , "Move around nervously" , "Squirm" , "Move nervously or impatiently" , "Make small movements through nervousness or impatience" .)