Place out an unsatisfactory musk-melon (10)
I believe the answer is:
cantaloupe
'musk-melon' is the definition.
(I've seen this before)
'place out an unsatisfactory' is the wordplay.
'unsatisfactory' indicates anagramming the letters (I've seen this in other clues).
'place'+'out'+'an'='placeoutan'
'placeoutan' is an anagram of 'CANTALOUPE'.
(Other definitions for cantaloupe that I've seen before include "Small melon with ribbed skin" , "musk melon" , "Type of melon" , "Musk-melon" , "fruit" .)