Finance administrator spending some hours in the bar (6)

I believe the answer is:

bursar

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'finance administrator' is the definition.
'bursar' can be an answer for 'administrator' (I've seen this before). I am unsure of the 'finance' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bursar that I've seen before include "administrator" , "School finance director" , "Person who manages finances of school or college" , "Finance manager for school or college" , "Financial manager of a college" .)

I've seen this clue in the Evening Standard.

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