Vague recipes I'm adapting (9)
I believe the answer is:
imprecise
'vague' is the definition.
(synonyms)
'recipes i'm adapting' is the wordplay.
'adapting' is an anagram indicator.
'recipes'+'im'='recipesim'
'recipesim' is an anagram of 'IMPRECISE'.
(Other definitions for imprecise that I've seen before include "Inaccurate" , "Not true" , "Lacking exactness" , "not quite right" , "Not very nice" .)