Follow us up in an absolute sense (6)

I believe the answer is:

pursue

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'follow' is the definition.
(to pursue is to follow or chase)

'us up in an absolute sense' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'in' indicates putting letters inside.
'an absolute sense' becomes 'pure' (I can't justify this - if you can you should believe this answer much more).
'us' anagrammed gives 'su'.
'su' put within 'pure' is 'PURSUE'.

Can you help me to learn more?

(Other definitions for pursue that I've seen before include "Follow up on or go after" , "Dog" , "Engage in or chase after" , "Follow, chase" , "Chase, run after" .)

I've seen this clue in the Evening Standard.

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