As first one, I get on and look around (7)
I believe the answer is:
pioneer
'as' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'first one i get on and look around' is the wordplay.
'first one i' becomes 'peer' (I am not sure about this - if you are sure you should believe this answer much more).
'get' indicates putting letters inside.
'and' says to put letters next to each other (I've seen this in other clues).
'look' becomes 'air' (I've seen this before).
'around' says to take the centre.
The middle letter of 'air' is 'i'.
'on' after 'i' is 'ion'.
'peer' placed around 'ion' is 'PIONEER'.
Can you help me to learn more?
(Other definitions for pioneer that I've seen before include "Original developer" , "Lead the way" , "First explorer" , "true original" , "make the first move!" .)