Desirable as a spouse (8)
I believe the answer is:
eligible
'desirable as a spouse' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eligible that I've seen before include "Suitable or deserving" , "Entitled, suitable" , "Acceptable" , "Regarded as desirable, say for marriage" , "Qualified or fit as bachelor may be" .)