Foolish in record time (5)
I believe the answer is:
inept
'foolish' is the definition.
(thesaurus)
'in record time' is the wordplay.
'record' becomes 'ep'.
'time' becomes 't'.
'in'+'ep'+'t'='INEPT'
(Other definitions for inept that I've seen before include "Cack-handed" , "Useless, awkward" , "Standard required in a piece of work (colloq.)" , "Showing a lack of competence" , "Unsuitable, clumsy" .)