Male relation, oddly airy and vague (7)
I believe the answer is:
unclear
'vague' is the definition.
(I've seen this before)
'male relation oddly airy' is the wordplay.
'male relation' becomes 'uncle' (I've seen this before).
'oddly' indicates alternate letters.
The alternating letters of 'airy' are 'ar'.
'uncle'+'ar'='UNCLEAR'
'and' is the link.
(Other definitions for unclear that I've seen before include "Indistinct" , "Not easy to grasp" , "Cloudy or opaque" , "Not transparent or intelligible" , "An ulcer (anag)" .)