Criticise expert with a universal remedy (7)
I believe the answer is:
panacea
'universal remedy' is the definition.
(I've seen this before)
'criticise expert with a' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'expert' becomes 'ace' (ace can informally mean very good).
'with' says to put letters next to each other.
'pan'+'ace'+'a'='PANACEA'
(Other definitions for panacea that I've seen before include "offering solution to all ills" , "that'll solve everything" , "Remedy for all kinds of diseases or troubles" , "A cure-all for diseases or troubles" , "A soldier in the World War One Aus. and NZ Army Corps" .)