Days in March initially quite dark (3)
I believe the answer is:
dim
'quite dark' is the definition.
'dim' can be an answer for 'dark' (similar in meaning). I'm unsure of the 'quite' bit.
'days in march initially' is the wordplay.
'initially' says to take the initial letters.
The initial letters of 'days in march' is 'DIM'.
Can you help me to learn more?
(Other definitions for dim that I've seen before include "progressing towards piano" , "Not brilliant" , "Unpromising" , "Slow-witted" , "out of mind?" .)