Oscar training a single parent to become model? (7)
I believe the answer is:
optimum
'model?' is the definition.
(thesaurus)
'oscar training a single parent' is the wordplay.
'oscar' becomes 'o' (phonetic alphabet: alpha, bravo, charlie etc.).
'training' becomes 'pt'.
'a single' becomes 'i' (one).
'parent' becomes 'mum' (mum is a kind of parent).
'o'+'pt'+'i'+'mum'='OPTIMUM'
'to become' is the link.
(Other definitions for optimum that I've seen before include "Best, most favourable" , "Most favourable point" , "model" , "top condition" , "Most favourable (conditions)" .)