It's just like a man to have a bit of kip in bed (5)
I believe the answer is:
biped
'kip in bed' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'it's just like a man to have a bit' is the wordplay.
'it's just like' becomes 'bp' (I am not sure about this - if you are sure you should believe this answer much more).
'a man' becomes 'Ed' (short for Edward).
'to have' means one lot of letters goes inside another.
'a bit' becomes 'i' (resembles b, a binary digit or bit).
'bp'+'ed'='bped'
'bped' placed around 'i' is 'BIPED'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for biped that I've seen before include "Toddler is an example" , "One standing on two feet" , "Creature with two feet" , "One walking on two feet" , "Walker on two feet" .)