Girl detailed to go (4)
I believe the answer is:
wend
'go' is the definition.
(archaic word for 'go', present tense of 'went')
'girl detailed' is the wordplay.
'girl' becomes 'Wendy' (girl's name).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'wendy' with its last letter taken away is 'WEND'.
'to' acts as a link.
(Other definitions for wend that I've seen before include "Slav" , "Make (ones way)" , "Travel" , "... one's way, go on a journey" , "Slowly go" .)