The field to be in credit, that's clear (3)
I believe the answer is:
lea
'the field' is the definition.
(lea can mean a meadow or field of grass)
'be in credit that's clear' is the wordplay.
'LEA' is hidden in amongst the letters.
But, I'm unsure how this is indicated.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for lea that I've seen before include "Tract of pastureland" , "area of grassland" , "River flowing through London" , "Open grassy land; river" , "Grass area" .)