Awfully game bid to secure ten, an assortment (5,3)
I believe the answer is:
mixed bag
'an assortment' is the definition.
(I have seen 'Varied assortment ' mean 'mixed bag' so perhaps 'assortment' could also mean 'mixed bag')
'awfully game bid to secure ten' is the wordplay.
'awfully' is an anagram indicator.
'to secure' is an insertion indicator.
'ten' becomes 'x' (roman numeral).
'game'+'bid'='gamebid'
'gamebid' anagrammed gives 'miedbag'.
'miedbag' enclosing 'x' is 'MIXED BAG'.
(Other definitions for mixed bag that I've seen before include "potpourri?" , "Miscellany" , "Varied assortment" , "Diverse assortment" , "various items" .)