Universal remedy an expert brought in annually (7)
I believe the answer is:
panacea
'universal remedy' is the definition.
(I've seen this before)
'an expert brought in annually' is the wordplay.
'expert' becomes 'ace' (ace can informally mean very good).
'brought in' indicates putting letters inside.
'annually' becomes 'p.a.' (synonyms).
'an'+'ace'='anace'
'anace' inserted within 'pa' is 'PANACEA'.
(Other definitions for panacea that I've seen before include "Cure for all things" , "Hypothetical universal remedy" , "Universal medicine" , "that will cure anything" , "that's going to help a lot" .)