Description of awfully nice gal? (7)
I believe the answer is:
angelic
'description' is the definition.
The answer and definition are not the same part of speech.
'awfully nice gal?' is the wordplay.
'awfully' indicates anagramming the letters.
'nice'+'gal'='nicegal'
'nicegal' anagrammed gives 'ANGELIC'.
'of' is the link.
(Other definitions for angelic that I've seen before include "Sweet and well-behaved" , "Pure; innocent" , "in the manner of Gabriel?" , "Sweet, kind and beautiful" , "Heavenly - entrancing" .)