Less than a clear field? (3)
I believe the answer is:
lea
'clear field?' is the definition.
'lea' can be an answer for 'field?' (lea can mean a meadow or field of grass). I am not certain of the 'clear' bit.
'less than a' is the wordplay.
'less than' becomes 'le' (I am not sure about this - if you are sure you should believe this answer much more).
'le'+'a'='LEA'
Can you help me to learn more?
(Other definitions for lea that I've seen before include "authority for teachers" , "Field" , "'The lowing herd wind slowly o'er the . . .'" , "Poetically, a piece of meadow or pasture" , "Open area of grassy or arable land" .)