Grassy area with some gravel deposits (4)
I believe the answer is:
veld
'grassy area' is the definition.
'veld' can be an answer for 'area' (veld is a kind of area). I'm not sure about the 'grassy' bit.
'with some gravel deposits' is the wordplay.
'with' indicates the answer is hidden within the clue.
'VELD' is hidden in the letters of 'some gravel deposits'.
Can you help me to learn more?
(Other definitions for veld that I've seen before include "Sort of country" , "High grassland in southern Africa" , "Open country in S Africa" , "Open grassland of southern Africa" .)