Upset lady geek detailed seductive glance (4,3)
I believe the answer is:
glad eye
'seductive glance' is the definition.
(I've seen this before)
'upset lady geek detailed' is the wordplay.
'upset' indicates an anagram.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'lady'+'geek'='ladygeek'
'ladygeek' with its final letter taken away is 'ladygee'.
'ladygee' is an anagram of 'GLAD EYE'.
(Other definitions for glad eye that I've seen before include "look to attract lover?" , "Seductive glance" , "A look that could excite" , "stare" , "Seductive look" .)