Park personnel first measure, then put new handle on (10)
I believe the answer is:
rechristen
'put new handle on' is the definition.
I can't judge whether this definition defines the answer.
'park personnel first measure' is the wordplay.
'park' becomes 'rec' (I've seen this in other clues).
'personnel' becomes 'hr' (Human Resources).
'first' becomes 'ist' (**).
'measure' becomes 'en' (en is a kind of measure).
'rec'+'hr'+'ist'+'en'='RECHRISTEN'
'then' acts as a link.
(Other definitions for rechristen that I've seen before include "Name anew" , "Give a new name to" , "Name afresh" .)