US coach errs badly, providing intensive training (5,6)
I believe the answer is:
crash course
'intensive training' is the definition.
(I've seen this before)
'us coach errs badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'us'+'coach'+'errs'='uscoacherrs'
'uscoacherrs' with letters rearranged gives 'CRASH COURSE'.
'providing' is the link.
(Other definitions for crash course that I've seen before include "accelerated learning programme" , "Intensive programme of instruction" , "Intensive training" , "where demolition derby takes place?" .)