Cleaner married for attractiveness (5)
I believe the answer is:
charm
'attractiveness' is the definition.
(charm is a kind of attractiveness)
'cleaner married' is the wordplay.
'cleaner' becomes 'char' (charwoman is a type of cleaner).
'married' becomes 'm'.
'char'+'m'='CHARM'
'for' acts as a link.
(Other definitions for charm that I've seen before include "Power of fascination" , "Entrance, bewitch" , "Enchant" , "Bewitch or delight" , "Personal attraction" .)