“When work’s subject to error, see supervisor” (6 letters). Answer: Bishop! The clue comes from a fairly recent Times crossword, and depends on the word bish meaning “error”.
The OED claims not to know the etymology of the word in this usage, but I fear the worst… In the sense of “mistake, blunder” it is first recorded in Partridge’s famous Dictionary of Slang of 1937:
Bish,..a mistake: Seaford Preparatory School: from ca. 1925. and then 1955 F. SWINNERTON Sumner Intrigue xx. 198 He’s always making bishes like this! 1956 B. GOOLDEN At Foot of Hills x. 236 She..suddenly realised she’d made an [sic] complete bish.
Oz and Kiwi slang used the word as a verb to mean “throw” – so Ngaio Marsh (a Kiwi of course) has in Surfeit of Lampreys
and the word is used as both a noun and a verb as a jocular abbreviation of “bishop”, the OED quotes being worth rehearsing in full:
1875 A. PORSON Quaint Words 20 To be bish’d..confirmed. 1927 WODEHOUSE Meet Mr. Mulliner iii. 88 He turned appealingly from one to the other. ‘Vicar! Bish!’ 1930 Outlook & Independent 29 Oct. 328/3 Some one..asked in amazement, ‘When does the Bishop bish?’ 1958 I. MURDOCH Bell 247, I suppose I’d better leave the way clear for the bish’s Rolls Royce.
I’ll just go and ask my man to warm up the Rolls ready for this evening’s confirmation …
Filed under: Words

this game,” It made it into national politics in 2004 when ‘As a former Cabinet member of Major’s government, Michael Howard has an even harder job ahead of him. He has to show he has enough bouncebackability to get him into Number Ten.’ 

