Knowing a Hertfordshire town (5)

I believe the answer is:

aware

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'knowing' is the definition.
(I've seen this before)

'a hertfordshire town' is the wordplay.
'hertfordshire town' becomes 'ware' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'ware'='AWARE'

Can you help me to learn more?

(Other definitions for aware that I've seen before include "Conscious or having knowledge of" , "Bearing in mind" , "Having knowledge (of fact)" , "Knowing (of something)" , "Apprised or informed" .)

I've seen this clue in The Sun.

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