The sort of solution if aliens are awkward? (6)
I believe the answer is:
saline
'the sort of solution' is the definition.
'aliens are awkward?' is the wordplay.
'are awkward?' indicates anagramming the letters.
'aliens' is an anagram of 'SALINE'.
'if' is the link.
(Other definitions for saline that I've seen before include "Salty like sea water" , "Intravenous feeding" , "Salty to aliens" , "Containing or tasting of salt" , "Like contents of cellar" .)