Good-looking six-footer foolishly married short lady (3,7)
I believe the answer is:
red admiral
'good-looking six-footer' is the definition.
'foolishly married short lady' is the wordplay.
'foolishly' indicates an anagram.
'short' means to remove the last letter.
'lady' with its final letter removed is 'lad'.
'married'+'lad'='marriedlad'
'marriedlad' with letters rearranged gives 'RED ADMIRAL'.
(Other definitions for red admiral that I've seen before include "Species of butterfly" , "Vanessa" , "Winger" , "Tiny flier" , "of interest to entomologists?" .)