Pleased about field (3)
I believe the answer is:
lea
'field' is the definition.
(lea can mean a meadow or field of grass)
'pleased about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'LEA' is hidden within 'pleased'.
(Other definitions for lea that I've seen before include "grazing area" , "River flowing through London" , "Open pasture" , "River of east London" , "Grass area" .)