Crossword Genius

Container of a brown bookend (4)

Ross

I believe the answer is:

tank

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

'container' is the definition.
(I know that tank is a type of container)

'a brown bookend' is the wordplay.
'a brown' becomes 'tan' (tan is a kind of brown).
'bookend' becomes 'k' (I can't explain this - if you can you should believe this answer much more).
'tan'+'k'='TANK'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for tank that I've seen before include "War machine" , "Fighting vehicle" , "Fuel store" , "Army vehicle - reservoir" , "One has gun" .)

I've seen this clue in the Evening Standard.
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