Rake used behind British cook (5)
I believe the answer is:
baker
'cook' is the definition.
(I've seen this before)
'rake used behind british' is the wordplay.
'used' indicates an anagram.
'behind' says to put letters next to each other.
'british' becomes 'b' (abbreviation e.g. in 'BBC'**).
'rake' is an anagram of 'aker'.
'aker' after 'b' is 'BAKER'.
(Other definitions for baker that I've seen before include "Break (anag.)" , "job" , "Maker of cakes/bread" , "Bread and cakes maker" , "Tradesman; Sherlock Holmes's Street" .)