A second layer devoid of colour (5)
I believe the answer is:
ashen
'colour' is the definition.
(I know that ashen is a colour)
'a second layer' is the wordplay.
'second' becomes 's' (common abbreviation).
'layer' becomes 'hen' (something which lays - eggs in this case).
'a'+'s'+'hen'='ASHEN'
'devoid of' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ashen that I've seen before include "Drained of colour" , "So vampire might appear" , "Anaemic looking" , "White-faced" , "(Of face) pale (with shock)" .)