Group with knight and bishop backed city (7)

I believe the answer is:

bristol

I'm a little stuck... Click here to teach me more about this clue!

'city' is the definition.
(I know that Bristol is a city)

'group with knight and bishop backed' is the wordplay.
'group with' becomes 'lot' (I am not sure about the 'with' bit.).
'knight' becomes 'sir' (a knight has the title Sir).
'and' says to put letters next to each other.
'bishop' becomes 'B' (chess abbreviation).
'backed' says the letters should be written in reverse.
'lot'+'sir'+'b'='lotsirb'
'lotsirb' backwards is 'BRISTOL'.

Can you help me to learn more?

(Other definitions for bristol that I've seen before include "West Country city" , "English city" , "10 in SW England" , "Place associated with fashion" , "Port in SW England" .)

I've seen this clue in The Telegraph.

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