View irrational figure tucking into vegetable (7)
I believe the answer is:
opinion
'view' is the definition.
(I know that view can be written as opinion)
'irrational figure tucking into vegetable' is the wordplay.
'irrational figure' becomes 'pi' (pi is an irrational number).
'tucking into' means one lot of letters goes inside another.
'vegetable' becomes 'onion' (onion is a vegetable).
'pi' put inside 'onion' is 'OPINION'.
(Other definitions for opinion that I've seen before include "Unproved belief or view" , "Viewpoint" , "Belief or conviction" , "Assessment" , "impression" .)