It's clear I had to receive a good deal of luck (5)
I believe the answer is:
lucid
'it's clear' is the definition.
(similar in meaning)
'i had to receive a good deal of luck' is the wordplay.
I cannot really see how this works, but
'i' is found in the answer.
'had' could be 'd' (in contractions e.g. 'I'd', 'you'd' etc) and 'd' is located in the answer.
The remaining letters 'luc' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lucid that I've seen before include "Quite clear" , "Coherent" , "Intellectually bright" , "Easily understood; sane" , "Easy to understand, clearly expressed" .)