Seasonal workers understand about very large wheels (5)
I believe the answer is:
elves
'seasonal workers' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'understand about very large wheels' is the wordplay.
'understand' becomes 'see' ('see' can be a synonym of 'understand').
'about' indicates putting letters inside.
'very' becomes 'v' (abbreviation).
'large' becomes 'l'.
'wheels' says the letters should be written backwards (to wheel can mean to turn around).
'v'+'l'='vl'
'see' enclosing 'vl' is 'sevle'.
'sevle' written backwards gives 'ELVES'.
Can you help me to learn more?
(Other definitions for elves that I've seen before include "Santa's little helpers" , "Sprites" , "Inhabitants of 8 down" , "Imps, pixies" , "Fairy-like beings" .)