Alexander has opinion about nude seen here and there (5)
I believe the answer is:
'alexander' is the definition.
(nickname for Alexander)
'opinion about nude seen here and there' is the wordplay.
'opinion' becomes 'say' (as in getting a say in something).
'about' indicates putting letters inside.
'seen here and there' means one should take alternating letters (letters removed at regular intervals).
The alternating letters of 'nude' are 'nd'.
'say' going around 'nd' is 'SANDY'.
'has' acts as a link.
(Other definitions for sandy that I've seen before include "Boy's or girl's name -- like a beach" , "Like many beaches" , "(Of hair)light yellowish brown" , "Hair colour" , "Ginger" .)