Though lazy, I'd almost gone ahead (4)
I believe the answer is:
idle
'though lazy' is the definition.
'idle' can be an answer for 'lazy' (similar in meaning). I am not certain of the 'though' bit.
'i'd almost gone ahead' is the wordplay.
'i'd' becomes 'le' (I am not sure about this - if you are sure you should believe this answer much more).
'almost' means to remove the first letter.
'gone' becomes 'did' (doing is a kind of going).
'ahead' means one lot of letters go next to another (some letters go in front of others).
'did' with its first letter removed is 'id'.
'le' put after 'id' is 'IDLE'.
Can you help me to learn more?
(Other definitions for idle that I've seen before include "Without work" , "Eric, perhaps" , "lndolent" , "goalless" , "Lazy - vain" .)