Nat has to look around for the body (6)
I believe the answer is:
senate
'the body' is the definition.
(I have seen 'Political body' mean 'senate' so perhaps 'body' could also mean 'senate')
'nat has to look around' is the wordplay.
'has' is a charade indicator (letters next to each other).
'to' becomes 'se' (I can't explain this - if you can you should give a lot more credence to this answer).
'look' becomes 'see'.
'around' says to take the centre.
The middle letter of 'see' is 'e'.
'nat' put after 'se' is 'senat'.
'senat'+'e'='SENATE'
'for' is the link.
Can you help me to learn more?
(Other definitions for senate that I've seen before include "Second house of the Oireachtas" , "Upper assembly of US" , "Political body" , "The upper house in parliament or oireachtas" , "Legislative assembly" .)