Doctor lets us scrap (6)
I believe the answer is:
tussle
'scrap' is the definition.
(thesaurus)
'doctor lets us' is the wordplay.
'doctor' indicates anagramming the letters.
'lets'+'us'='letsus'
'letsus' anagrammed gives 'TUSSLE'.
(Other definitions for tussle that I've seen before include "Rough and tumble" , "Grapple" , "Wrestle, scuffle" , "Skirmish" , "Struggle like wrestling bout" .)