Mollusc ordered as saline? (3,5)
I believe the answer is:
sea snail
'mollusc' is the definition.
(I have seen 'Marine mollusc ' mean 'sea snail' so perhaps 'mollusc' could also mean 'sea snail')
'ordered as saline?' is the wordplay.
'ordered' indicates an anagram.
'as'+'saline'='assaline'
'assaline' with letters rearranged gives 'SEA-SNAIL'.
(Other definitions for sea snail that I've seen before include "wet crawler" , "Spiral-shelled marine mollusc" , "Creeping marine creature with a spiral shell" .)